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A1 noun #1,183 le plus courant 17 min de lecture

Celsius

Top 1,183

At the A1 level, you only need to know that Celsius is a way to talk about the temperature. It tells us how hot or cold it is. You will see it in the weather news. For example, 'It is 25 degrees Celsius today.' This means it is a nice, warm day. You should also know two important numbers: 0 and 100. At 0 degrees Celsius, water turns into ice. This is very cold. At 100 degrees Celsius, water boils and becomes steam. This is very hot. You use Celsius when you travel to most countries in the world. When you write it, you use a big 'C'. You can also use a small circle like this: 20°C. This is the most common way to measure temperature for beginners. You might hear your teacher say, 'What is the temperature in Celsius?' and you can answer with a simple number. It is a very useful word for daily life, like talking about the weather or how you feel when you have a cold.

At the A2 level, you can use Celsius in more situations, such as cooking and basic health. You know that a normal human body temperature is about 37 degrees Celsius. If your temperature is 39 degrees Celsius, you have a fever and should see a doctor. In the kitchen, you might see recipes that tell you to set the oven to 180 degrees Celsius. You can also describe the weather more specifically, like 'The temperature will be between 15 and 20 degrees Celsius.' You are starting to understand that Celsius is part of the metric system, which is used in many countries. You can compare temperatures using Celsius, for example, 'Today is 5 degrees Celsius colder than yesterday.' You should also be careful with the spelling and always remember to capitalize the 'C'. This level involves using Celsius to manage your daily routine, from choosing what to wear to following a simple baking recipe.

At the B1 level, you should be comfortable using Celsius in professional and academic contexts. You can discuss climate and environment using this scale. For example, you might read an article about how the average temperature of the Earth is rising by 1.5 degrees Celsius. You can also use Celsius to explain scientific processes in a simple way, such as 'The chemical reaction occurs best at 40 degrees Celsius.' You are aware that Celsius was formerly called 'centigrade' and you might encounter that word in older books. You can also convert temperatures roughly between Celsius and Fahrenheit if you are talking to someone from the United States. You understand that Celsius is a standard unit in the International System of Units (SI). Your vocabulary is growing to include related words like 'thermometer', 'scale', and 'measurement', all of which you can use alongside Celsius to provide more detailed information in your speaking and writing.

At the B2 level, you can use Celsius with precision in technical discussions. You might work in engineering, medicine, or science where exact temperatures are critical. You understand that the Celsius scale is defined by the Kelvin scale and can explain the relationship between them (0°C = 273.15K). you can use Celsius to describe complex phenomena, such as the 'Celsius gradient' in a specific environment or the 'thermal properties' of a material measured in degrees Celsius. You are also able to participate in debates about global warming, using Celsius to cite specific data and trends. Your writing is accurate, and you follow international standards for symbols and spacing (e.g., 25 °C). You can also handle more complex sentence structures, such as 'The melting point of this alloy is significantly higher than 500 degrees Celsius, making it suitable for high-heat applications.' This level requires a high degree of accuracy and the ability to use the term in a variety of formal and informal registers.

At the C1 level, you have a nuanced understanding of the Celsius scale's history and its role in global standardization. You can discuss the 1948 transition from 'centigrade' to 'Celsius' and the reasons behind it, such as avoiding confusion with angular measurements. You use the term effortlessly in high-level academic writing and professional presentations. You are aware of the subtle differences in style guides regarding the degree symbol and can adapt your writing accordingly. You can also discuss the philosophical implications of temperature scales and how they shape our perception of the physical world. For instance, you might analyze how the choice of 0 and 100 as reference points in the Celsius scale reflects a human-centric view of nature. Your ability to use Celsius extends to interpreting complex data sets in climate science, thermodynamics, and industrial engineering, where you can synthesize information and present it clearly to both expert and non-expert audiences.

At the C2 level, your mastery of the term Celsius is complete. You can use it in the most sophisticated scientific contexts, discussing the redefinition of the Celsius scale in terms of the Boltzmann constant rather than the properties of water. You are familiar with the historical evolution of the scale from Anders Celsius's original inverted version (where 0 was boiling and 100 was freezing) to the modern version we use today. You can write and speak about temperature with absolute precision, navigating the complexities of thermodynamic equilibrium and absolute scales with ease. You are also a master of the cultural and linguistic nuances of the term, able to explain its significance in the history of science and its role as a symbol of international cooperation and the Enlightenment's drive for rational measurement. Your use of Celsius is indistinguishable from that of a highly educated native speaker or a professional scientist, demonstrating a profound command of both the language and the underlying concepts.

Entraîne-toi Exemples Notes et astuces

Celsius en 30 secondes

Celsius is the primary global scale for measuring temperature, defined by water freezing at 0° and boiling at 100°.
Named after Anders Celsius, it is a key part of the metric system and is used in science, medicine, and daily life.
It is abbreviated as °C and is always capitalized because it is a proper noun derived from a scientist's name.
While the US uses Fahrenheit, Celsius is the standard for international communication, aviation, and environmental science.

The term Celsius refers to a specific scale of temperature measurement that is used almost everywhere in the world today. It is a metric-based system where the freezing point of water is defined as zero degrees and the boiling point of water is defined as one hundred degrees under standard atmospheric pressure. This simplicity makes it the preferred choice for scientists, engineers, and the general public in most countries. When you check the weather forecast on your phone in Paris, Tokyo, or Sydney, the numbers you see represent degrees Celsius. It is not just a scientific tool; it is a fundamental part of how we understand our environment and our physical comfort. For example, a room temperature of twenty degrees Celsius is generally considered comfortable, while a body temperature of thirty-seven degrees Celsius is the standard for a healthy human being. Understanding this scale is essential for international travel, scientific literacy, and daily communication in a globalized world.

Scientific Basis: The Celsius scale is derived from the Kelvin scale, which is the primary unit of temperature in the International System of Units. Zero degrees Celsius is exactly equal to two hundred seventy-three point one five Kelvin. This relationship ensures that the Celsius scale remains precise and consistent across all scientific disciplines, from chemistry to meteorology.
Global Adoption: While the United States primarily uses the Fahrenheit scale, the rest of the world has transitioned to Celsius. This transition, often called metrication, occurred throughout the twentieth century to standardize measurements and facilitate international trade and cooperation. Today, even in the United States, Celsius is used extensively in scientific research and medical contexts.
Daily Application: In daily life, Celsius is used to describe the weather, set oven temperatures for cooking, and monitor health. A fever is typically defined as a body temperature above thirty-eight degrees Celsius. Knowing that water freezes at zero degrees helps people prepare for icy roads or winter gardening, making the scale a practical necessity for safety and planning.

The weather report indicates that the temperature will drop to five degrees Celsius tonight, so please make sure to bring your plants inside to protect them from the cold.

To properly sterilize the equipment, the water must reach a consistent temperature of exactly one hundred degrees Celsius.

Scientists recorded a record-breaking temperature of fifty-four degrees Celsius in the desert during the peak of the summer heatwave.

The recipe requires the oven to be preheated to one hundred eighty degrees Celsius for the cake to bake evenly.

A comfortable swimming pool temperature is usually maintained between twenty-five and twenty-eight degrees Celsius.

In summary, Celsius is more than just a number on a thermometer; it is a universal language of temperature. Whether you are discussing the melting point of iron in a laboratory or the warmth of a summer day at the beach, Celsius provides a clear, logical, and standardized way to communicate thermal energy. Its integration into the metric system ensures that it remains the dominant scale for the foreseeable future, connecting people across borders through a shared understanding of the physical world. As climate change becomes an increasingly urgent global topic, Celsius is also the primary scale used to track the rising temperatures of our planet, making it a vital term for understanding environmental news and policy discussions. By mastering the use of Celsius, you gain the ability to navigate international contexts with confidence and precision, whether you are traveling, studying, or working in a professional field.

Using the word Celsius correctly in a sentence involves understanding its grammatical role as a noun that often functions as a modifier for the word 'degrees'. It is rarely used alone; instead, it almost always follows a numerical value and the word 'degrees'. For example, you would say 'twenty degrees Celsius' rather than just 'twenty Celsius'. In written form, it is frequently abbreviated to the symbol ° followed by a capital C, as in 20°C. However, in formal writing or when clarity is paramount, the full word is often preferred. The word Celsius is always capitalized because it is a proper noun, a tribute to Anders Celsius. This capitalization remains even when the word is used as an adjective, such as in the phrase 'the Celsius scale'. Understanding these nuances ensures that your writing is professional and accurate.

Numerical Agreement: When using Celsius with numbers, the word 'degrees' is usually plural unless the temperature is exactly one or minus one. For example, 'It is one degree Celsius' but 'It is zero degrees Celsius'. This can be confusing for learners, but the plural 'degrees' is the standard for zero and all numbers other than one. In casual conversation, people might omit 'degrees' and just say 'It is twenty Celsius', but this is considered informal and should be avoided in academic or professional settings.
Prepositional Usage: Celsius is often used with prepositions like 'at', 'to', or 'in'. You might say 'Water boils at 100 degrees Celsius' or 'The temperature rose to 30 degrees Celsius'. When describing a range, you would say 'The temperature fluctuates between 10 and 15 degrees Celsius'. These prepositions help define the relationship between the temperature and the action or state being described.
Comparative Structures: When comparing temperatures, Celsius is used to provide a specific reference point. For example, 'Today is five degrees Celsius warmer than yesterday'. It can also be used to contrast with other scales: 'The scientist converted the data from Fahrenheit to Celsius to comply with international standards'. These comparisons are vital in scientific reports and weather analysis.

The experiment requires the solution to be kept at exactly four degrees Celsius to prevent the enzymes from denaturing.

During the winter months, the average daytime temperature in this region rarely exceeds ten degrees Celsius.

The pilot informed the passengers that the outside air temperature at thirty thousand feet was minus fifty degrees Celsius.

In many European countries, the thermostat is typically set to twenty-one degrees Celsius during the evening.

The heatwave pushed the mercury up to a blistering forty-five degrees Celsius, breaking all previous records for the month of July.

Furthermore, the word Celsius is integral to discussing climate change and global warming. Scientists often speak about the goal of limiting global temperature increases to 1.5 or 2 degrees Celsius above pre-industrial levels. In these contexts, the word carries significant weight and urgency. It is also used in medical settings to describe a patient's condition; for instance, a nurse might record a temperature of 39.5 degrees Celsius, indicating a high fever. Whether you are in a lab, a hospital, a kitchen, or just chatting about the weather, the word Celsius is a versatile and essential part of your vocabulary. By practicing its use in various sentence structures, you will become more comfortable with both the technical and everyday aspects of the English language. Remember that accuracy in temperature measurement can be a matter of life and death in some fields, so using the term correctly is not just about grammar, but about clear and effective communication.

The word Celsius is ubiquitous in international media, scientific discourse, and daily life outside the United States. If you turn on a news channel like the BBC, Al Jazeera, or Deutsche Welle, the weather segment will exclusively use Celsius to describe the day's forecast. You will hear meteorologists say things like, 'Expect a high of twenty-four degrees Celsius in London today.' This is the primary way people in Europe, Asia, Africa, and South America understand the weather. In addition to weather reports, you will hear Celsius in academic settings. Biology, chemistry, and physics classes all use Celsius as the standard for measuring thermal energy. Professors will discuss the melting points of elements or the optimal temperatures for chemical reactions using this scale. If you are a student or a professional in a STEM field, you will encounter the word Celsius daily in textbooks, research papers, and laboratory instructions.

Travel and Aviation: When traveling internationally, you will hear pilots announce the outside temperature in Celsius. Airport displays and local signage in most countries will also show the temperature in this scale. This is important for travelers to know so they can dress appropriately for their destination. Hearing 'thirty degrees Celsius' in an airport in Singapore means you should prepare for significant heat and humidity.
Culinary Contexts: In the kitchen, especially when following international recipes or using modern appliances, Celsius is the standard. You will hear chefs on cooking shows specify temperatures like 'roast the chicken at two hundred degrees Celsius'. Many ovens sold outside the US only have Celsius markings, making it the essential language of cooking for millions of people.
Health and Wellness: In hospitals and clinics worldwide, medical professionals use Celsius to monitor patient health. You might hear a doctor say, 'The patient's temperature has dropped to thirty-six degrees Celsius, which is a good sign.' Digital thermometers in most countries are set to Celsius by default, making it the primary way families monitor fevers at home.

The weather anchor on the international news announced that the heatwave in Spain has reached forty-two degrees Celsius.

During the chemistry lecture, the professor explained that the liquid nitrogen is kept at minus one hundred ninety-six degrees Celsius.

The flight attendant mentioned that the temperature on the ground in Paris is a pleasant twenty-two degrees Celsius.

I heard the vet say that a dog's normal body temperature is around thirty-eight to thirty-nine degrees Celsius.

The documentary about the Arctic highlighted how the permafrost is melting as temperatures rise above zero degrees Celsius.

In the realm of environmental activism and global policy, the word Celsius is heard in every major speech regarding the climate crisis. The Paris Agreement, for example, is centered around the goal of keeping the global average temperature increase well below two degrees Celsius. This usage has moved the word from the laboratory into the public consciousness, making it a key term for anyone following current events. Furthermore, as technology advances, you will hear Celsius in the context of computing and electronics. Enthusiasts often discuss the 'operating temperature' of their computer processors, aiming to keep them below eighty degrees Celsius to ensure longevity and performance. Whether you are listening to a podcast about the latest tech, watching a nature documentary, or simply talking to a neighbor about the heat, the word Celsius is an inescapable and vital part of modern communication. Its reach extends from the microscopic world of cellular biology to the macroscopic scale of planetary climate systems, proving its importance across all levels of human knowledge and experience.

One of the most frequent mistakes learners make when using the word Celsius is misspelling it. It is often incorrectly written as 'Celcius' (with a 'c' instead of an 's' at the end) or 'Celsius' (with a lowercase 'c'). Remember that the word is named after Anders Celsius, so the 's' at the end and the capital 'C' at the beginning are both essential for correct spelling. Another common error involves the use of the word 'centigrade'. While 'centigrade' was the official name of the scale until 1948 and is still occasionally used by older speakers or in some historical texts, 'Celsius' is the only correct term in modern scientific and professional contexts. Using 'centigrade' can make your English sound slightly dated, although it is generally understood. Additionally, learners often struggle with the pluralization of 'degrees' when referring to zero. In English, we say 'zero degrees Celsius' (plural), not 'zero degree Celsius' (singular). The singular 'degree' is reserved only for the number one.

Capitalization Errors: Many people forget to capitalize the 'C' in Celsius. Because it is a proper noun derived from a surname, it must always be capitalized, regardless of where it appears in a sentence. This is a strict rule in both scientific and general writing. For example, 'The temperature is 20 degrees celsius' is incorrect; it must be '20 degrees Celsius'.
Confusion with Fahrenheit: A major conceptual mistake is confusing the values of Celsius and Fahrenheit. For instance, thinking that 32 degrees Celsius is freezing (it is actually 0 degrees Celsius) or that 100 degrees Celsius is a hot day (it is actually the boiling point of water). This can lead to dangerous errors in cooking, medicine, or travel planning. Always double-check which scale is being used, especially in international contexts.
Incorrect Symbol Placement: In written English, the degree symbol (°) should be placed immediately after the number, followed by the letter 'C'. There is often a debate about whether to include a space between the number and the symbol. The International System of Units (SI) recommends a space (e.g., 25 °C), but many style guides omit it (e.g., 25°C). However, placing the symbol after the 'C' (e.g., 25 C°) is always incorrect when referring to a specific temperature.

Incorrect: The water is boiling at 100 degrees celcius. (Spelling and capitalization error)

Incorrect: It is only one degrees Celsius outside. (Grammar error: 'one' should be followed by 'degree')

Incorrect: The patient has a fever of 102 Celsius. (Conceptual error: 102 Celsius would be fatal; the speaker likely meant Fahrenheit)

Incorrect: Set the oven to 200 Centigrades. (Terminology error: use Celsius, and 'centigrade' is not usually pluralized in this way)

Incorrect: The temperature dropped by 10 Celsius. (Omission error: should be '10 degrees Celsius')

Finally, be careful with the pronunciation. The first syllable 'Cel-' is pronounced like 'sell', and the 'sius' part is pronounced like 'see-us'. Some people mistakenly pronounce it as 'Kel-sius', which is incorrect. Mastering the pronunciation and spelling of Celsius will significantly improve your credibility when discussing scientific or international topics. It is also worth noting that in very informal speech, people might say 'It's 20 degrees' without specifying the scale. While this is fine if the context is clear (e.g., you are both in a country that uses Celsius), it is always safer to include the word Celsius to avoid any possible confusion, especially when communicating with people from different parts of the world. By being mindful of these common pitfalls, you can ensure that your use of the term is both accurate and professional, reflecting a high level of English proficiency and cultural awareness.

While Celsius is the most common scale for temperature, there are several other terms and scales that are related or used in different contexts. The most obvious alternative is Fahrenheit, which is the primary scale used in the United States. Understanding the difference between these two is crucial for anyone interacting with American media or traveling to the US. Another important term is Kelvin, which is the absolute temperature scale used in the physical sciences. Unlike Celsius, Kelvin does not use 'degrees'; instead, you simply say 'Kelvin'. For example, the freezing point of water is 273.15 Kelvin. In historical contexts, you might encounter the term Centigrade, which was the original name for the Celsius scale. While they are numerically identical, Celsius is the modern, preferred term. There are also less common scales like Rankine and Réaumur, though these are rarely encountered outside of very specific historical or engineering niches.

Celsius vs. Fahrenheit: The main difference is the starting point and the size of the degrees. In Celsius, water freezes at 0 and boils at 100. In Fahrenheit, water freezes at 32 and boils at 212. This means a Celsius degree is larger than a Fahrenheit degree. To convert Celsius to Fahrenheit, you multiply by 1.8 and add 32. This complexity is why the world has largely moved toward the simpler Celsius scale.
Celsius vs. Kelvin: Kelvin is an absolute scale, meaning it starts at absolute zero, the point where all molecular motion stops. Zero Kelvin is equal to -273.15 degrees Celsius. The size of one Kelvin is exactly the same as one degree Celsius, which makes converting between them very easy: just add or subtract 273.15. Kelvin is used in thermodynamics and astronomy where absolute temperatures are necessary.
Celsius vs. Centigrade: These two terms refer to the same scale. 'Centigrade' comes from the Latin 'centum' (hundred) and 'gradus' (steps), referring to the 100-degree interval between freezing and boiling. The name was changed to Celsius in 1948 to avoid confusion with other 'centigrade' measurements in some languages and to honor the scale's creator. Today, Celsius is the standard term.

While Americans are used to seeing 70 degrees Fahrenheit, most of the world would recognize that same warmth as 21 degrees Celsius.

In the study of cryogenics, temperatures are often measured in Kelvin, but they can be easily converted to Celsius for general understanding.

Old weather records might use the term 'centigrade', but modern reports will always use Celsius to describe the current climate.

The engineer noted that the thermal expansion was calculated using the Celsius scale to ensure compatibility with the metric components.

Comparing the Celsius readings of the two sensors revealed a slight calibration error in the secondary unit.

In conclusion, while Celsius is the dominant term, being aware of its alternatives like Fahrenheit and Kelvin is essential for a well-rounded understanding of temperature measurement. Each scale has its own specific use case, from the daily weather (Celsius/Fahrenheit) to advanced scientific research (Kelvin). By understanding how these scales relate to one another, you can more easily navigate different professional and cultural environments. Whether you are converting a recipe, reading a scientific paper, or simply trying to understand the weather in a foreign country, a clear grasp of Celsius and its counterparts will serve you well. Always remember to use the term that is most appropriate for your audience and context, and when in doubt, Celsius is almost always the safest and most widely understood choice in the modern world. Its logical structure and international acceptance make it a cornerstone of the global measurement system, facilitating everything from international trade to our shared understanding of the Earth's changing climate.

How Formal Is It?

Formel

Neutre

Informel

Child friendly

Argot

Le savais-tu ?

For over 200 years, the scale was known as 'centigrade'. The name was changed to Celsius in 1948 by the General Conference on Weights and Measures to avoid confusion with the 'grade' (or gon), a unit of angular measurement used in some countries. This change also honored Anders Celsius, aligning with other units like the Kelvin and the Fahrenheit.

Guide de prononciation

UK /ˈsɛl.si.əs/

US /ˈsɛl.si.əs/

The primary stress is on the first syllable: SEL-si-us.

Rime avec

Helios Various Serious Imperious Delirious Mysterious Nefarious Vicarious

Erreurs fréquentes

Pronouncing the first 'C' as a 'K' (e.g., Kel-sius).
Adding an extra 'i' sound (e.g., Cel-si-us-ee).
Pronouncing the 's' in the middle as a 'z' (e.g., Cel-zius).
Swapping the 's' and 'l' (e.g., Ces-lius).
Mumbling the final 'us' so it sounds like 'is'.

Niveau de difficulté

Lecture 1/5

The word is easy to recognize in text due to the capital 'C' and its proximity to numbers.

Écriture 2/5

Spelling can be tricky for beginners, especially the 's' at the end.

Expression orale 1/5

The pronunciation is straightforward once the first syllable is mastered.

Écoute 1/5

Easily identified in weather reports and scientific contexts.

Quoi apprendre ensuite

Prérequis

Degree Temperature Hot Cold Weather

Apprends ensuite

Fahrenheit Kelvin Thermometer Metric system Boiling point

Avancé

Thermodynamics Absolute zero Thermal expansion Specific heat capacity Convection

Grammaire à connaître

Capitalization of Proper Nouns

Always write 'Celsius' with a capital 'C'.

Pluralization of Units

Use 'degrees' (plural) for all numbers except one (e.g., 0 degrees, 1 degree, 2 degrees).

Prepositional Phrases for Measurement

Use 'at' for specific points: 'Water boils at 100 degrees Celsius'.

Compound Adjectives with Hyphens

Use a hyphen when Celsius modifies a noun: 'A 20-degree-Celsius increase'.

Subject-Verb Agreement with Temperature

The temperature 'is' 20 degrees (singular verb for the state of the weather).

Exemples par niveau

It is 30 degrees Celsius today.

Il fait 30 degrés Celsius aujourd'hui.

Use 'is' with temperature.

Water freezes at 0 degrees Celsius.

L'eau gèle à 0 degré Celsius.

Zero is followed by 'degrees' (plural).

Is it Celsius or Fahrenheit?

Est-ce en Celsius ou en Fahrenheit ?

Use 'or' to show a choice.

The water is 100 degrees Celsius.

L'eau est à 100 degrés Celsius.

100 is a large number, use 'degrees'.

I like 20 degrees Celsius.

J'aime quand il fait 20 degrés Celsius.

Simple subject-verb-object structure.

It is minus five degrees Celsius.

Il fait moins cinq degrés Celsius.

Use 'minus' for temperatures below zero.

Write 'C' for Celsius.

Écrivez 'C' pour Celsius.

Celsius is always capitalized.

The room is 22 degrees Celsius.

La pièce est à 22 degrés Celsius.

Use 'the' for a specific room.

Set the oven to 200 degrees Celsius.

Réglez le four à 200 degrés Celsius.

Imperative mood for instructions.

My body temperature is 37 degrees Celsius.

Ma température corporelle est de 37 degrés Celsius.

Possessive 'my' with 'body temperature'.

It is too hot at 40 degrees Celsius.

Il fait trop chaud à 40 degrés Celsius.

Use 'too' for excess.

The soup is 60 degrees Celsius.

La soupe est à 60 degrés Celsius.

Adjective phrase describing the soup.

Tomorrow will be 18 degrees Celsius.

Demain, il fera 18 degrés Celsius.

Future tense 'will be'.

The fridge is 4 degrees Celsius.

Le réfrigérateur est à 4 degrés Celsius.

Specific temperature for food safety.

Is 10 degrees Celsius cold for you?

Est-ce que 10 degrés Celsius est froid pour vous ?

Question form with 'is'.

The pool is 25 degrees Celsius.

La piscine est à 25 degrés Celsius.

Describing a state.

The climate is warming by two degrees Celsius.

Le climat se réchauffe de deux degrés Celsius.

Present continuous for ongoing change.

We measured the liquid at 15 degrees Celsius.

Nous avons mesuré le liquide à 15 degrés Celsius.

Past tense 'measured'.

Celsius is the standard scale in Europe.

Le Celsius est l'échelle standard en Europe.

Definite article 'the' with 'standard scale'.

The temperature dropped below zero degrees Celsius.

La température est descendue en dessous de zéro degré Celsius.

Preposition 'below' for lower values.

You should convert the data to Celsius.

Vous devriez convertir les données en Celsius.

Modal 'should' for advice.

The average summer temperature is 28 degrees Celsius.

La température moyenne en été est de 28 degrés Celsius.

Compound noun 'summer temperature'.

The machine operates at 50 degrees Celsius.

La machine fonctionne à 50 degrés Celsius.

Present simple for facts.

Is there a big difference between Celsius and Kelvin?

Y a-t-il une grande différence entre le Celsius et le Kelvin ?

Preposition 'between' for comparison.

The reaction was stabilized at exactly 37.5 degrees Celsius.

La réaction a été stabilisée à exactement 37,5 degrés Celsius.

Passive voice 'was stabilized'.

A rise of 1.5 degrees Celsius could be catastrophic.

Une hausse de 1,5 degré Celsius pourrait être catastrophique.

Modal 'could' for possibility.

The Celsius scale is widely adopted for its logical structure.

L'échelle Celsius est largement adoptée pour sa structure logique.

Adverb 'widely' modifying the participle.

Despite the heat, the lab stayed at 22 degrees Celsius.

Malgré la chaleur, le laboratoire est resté à 22 degrés Celsius.

Concession 'despite' followed by a noun.

The melting point of lead is 327.5 degrees Celsius.

Le point de fusion du plomb est de 327,5 degrés Celsius.

Technical fact using precise decimals.

They monitored the core temperature in degrees Celsius.

Ils ont surveillé la température centrale en degrés Celsius.

Past tense 'monitored'.

The thermal conductivity was tested at 100 degrees Celsius.

La conductivité thermique a été testée à 100 degrés Celsius.

Scientific terminology.

Celsius remains the primary unit for meteorological data.

Le Celsius reste l'unité principale pour les données météorologiques.

Linking verb 'remains'.

The 1948 conference officially renamed the scale to Celsius.

La conférence de 1948 a officiellement rebaptisé l'échelle en Celsius.

Historical narrative style.

Precise calibration in Celsius is vital for pharmaceutical storage.

Un étalonnage précis en Celsius est vital pour le stockage des produits pharmaceutiques.

Gerund phrase as subject.

The transition from centigrade to Celsius was motivated by clarity.

La transition du centigrade au Celsius était motivée par un souci de clarté.

Passive construction.

Researchers noted a Celsius fluctuation of nearly ten degrees.

Les chercheurs ont noté une fluctuation Celsius de près de dix degrés.

Noun as a modifier.

The Celsius scale facilitates international scientific collaboration.

L'échelle Celsius facilite la collaboration scientifique internationale.

Formal academic tone.

Temperature readings were standardized to Celsius for the report.

Les relevés de température ont été normalisés en Celsius pour le rapport.

Standardization terminology.

The nuances of the Celsius scale are taught in advanced physics.

Les nuances de l'échelle Celsius sont enseignées en physique avancée.

Subject-verb agreement with 'nuances'.

One must account for the Celsius offset when using older tools.

Il faut tenir compte du décalage Celsius lors de l'utilisation d'outils plus anciens.

Formal pronoun 'one'.

The redefinition of Celsius based on the Boltzmann constant ensures long-term stability.

La redéfinition du Celsius basée sur la constante de Boltzmann assure une stabilité à long terme.

Complex noun phrase as subject.

Anders Celsius's original scale was curiously inverted compared to our modern usage.

L'échelle originale d'Anders Celsius était curieusement inversée par rapport à notre usage moderne.

Possessive proper noun.

The Celsius scale serves as a bridge between everyday experience and thermodynamic theory.

L'échelle Celsius sert de pont entre l'expérience quotidienne et la théorie thermodynamique.

Metaphorical usage.

Discrepancies in Celsius measurements can lead to significant experimental error.

Des divergences dans les mesures Celsius peuvent entraîner une erreur expérimentale significative.

Plural subject with modal 'can'.

The ubiquity of Celsius in global discourse underscores the success of the metric system.

L'ubiquité du Celsius dans le discours mondial souligne le succès du système métrique.

Sophisticated vocabulary ('ubiquity', 'underscores').

A profound understanding of the Celsius scale is prerequisite for thermodynamic mastery.

Une compréhension profonde de l'échelle Celsius est un prérequis pour la maîtrise de la thermodynamique.

Adjective 'prerequisite' used as a complement.

The Celsius scale's reliance on the properties of water was eventually superseded by more fundamental constants.

La dépendance de l'échelle Celsius vis-à-vis des propriétés de l'eau a finalement été supplantée par des constantes plus fondamentales.

Passive voice with 'superseded'.

Philosophically, the Celsius scale represents the Enlightenment's quest for universal standards.

Philosophiquement, l'échelle Celsius représente la quête des Lumières pour des normes universelles.

Adverbial starter 'Philosophically'.

Synonymes

Centigrade C metric temperature degree Celsius

Antonymes

Fahrenheit Kelvin

Collocations courantes

Degrees Celsius

Celsius scale

Zero degrees Celsius

Celsius reading

Convert to Celsius

Celsius thermometer

In Celsius

Degrees in Celsius

Celsius system

Above/Below Celsius

Phrases Courantes

In degrees Celsius

The Celsius equivalent

Celsius and Fahrenheit

Room temperature in Celsius

Boiling point in Celsius

Freezing point in Celsius

Body temperature in Celsius

Negative Celsius

Celsius conversion

Celsius markings

Souvent confondu avec

Celsius vs Centigrade

The old name for the same scale. Use Celsius in modern contexts.

Celsius vs Fahrenheit

A different temperature scale where 32 is freezing and 212 is boiling.

Celsius vs Kelvin

A scientific scale where 0 is absolute zero, not the freezing point of water.

Expressions idiomatiques

"Zero degrees Celsius"

While not a traditional idiom, it is used metaphorically to describe a cold or unfriendly atmosphere. It implies a lack of warmth in a person's personality.

The reception we received was zero degrees Celsius.

Metaphorical

"Boiling at 100 Celsius"

Used to describe someone who is extremely angry or at their breaking point. It compares human emotion to the boiling point of water.

By the end of the meeting, he was boiling at 100 Celsius.

Informal

"A Celsius shift"

A small but significant change in a situation, often referring to climate or social atmosphere. It suggests a measurable difference.

There has been a Celsius shift in the company's culture lately.

Business

"Degrees of Celsius"

Sometimes used to imply a level of precision or a specific standard that must be met. It suggests being very exact.

The project was managed with degrees of Celsius precision.

Professional

"Below Celsius zero"

A way to describe something that is failing or in a very poor state. It uses the freezing point as a baseline for failure.

Our profits have gone below Celsius zero this quarter.

Informal

"The Celsius standard"

Used to refer to something that is the accepted norm or the logical choice. It compares the thing to the global temperature standard.

This software has become the Celsius standard for the industry.

Business

"Celsius-cool"

A modern slang term for someone who is very calm and collected, even under pressure. It plays on the 'cool' temperature readings.

She stayed Celsius-cool during the entire crisis.

Slang

"Rising Celsius"

A metaphor for increasing tension or a situation that is heating up. It is often used in political or social commentary.

The rising Celsius of the debate was evident to everyone.

Journalistic

"Celsius-grade"

Used to describe something that is high quality or meets international standards. It implies a level of professional certification.

We only use Celsius-grade materials in our construction.

Technical

"Absolute Celsius"

A humorous or emphatic way to say something is definitely true or completely certain. It mixes Celsius with the concept of absolute zero.

That is absolute Celsius truth.

Informal

Facile à confondre

Celsius vs Celcius

Common misspelling.

Celsius is the correct spelling with an 's' at the end. Celcius is incorrect.

Correct: Celsius. Incorrect: Celcius.

Celsius vs Centigrade

Historical usage.

Centigrade is the former name. Celsius is the modern, official name since 1948.

We use Celsius now, not centigrade.

Celsius vs Degree

Part of the measurement.

A degree is the unit, while Celsius is the scale. You need both for a full description.

The temperature is 10 degrees Celsius.

Celsius vs Fahrenheit

Alternative scale.

Fahrenheit uses different numbers for the same temperatures. 0°C is 32°F.

Americans use Fahrenheit, but Europeans use Celsius.

Celsius vs Calorie

Similar sound and scientific context.

A calorie is a unit of energy, while Celsius is a unit of temperature.

Heating water by one degree Celsius requires one calorie per gram.

Structures de phrases

It is [Number] degrees Celsius.

It is 25 degrees Celsius.

The [Noun] is [Number] degrees Celsius.

The oven is 180 degrees Celsius.

The temperature rose/fell to [Number] degrees Celsius.

The temperature fell to 5 degrees Celsius.

Measured at [Number] degrees Celsius, the [Noun]...

Measured at 40 degrees Celsius, the sample expanded.

A fluctuation of [Number] degrees Celsius was observed.

A fluctuation of 2 degrees Celsius was observed.

The scale, named Celsius after its creator, defines...

The scale, named Celsius after its creator, defines the freezing point as zero.

Between [Number] and [Number] degrees Celsius.

Keep the medicine between 2 and 8 degrees Celsius.

Is it [Number] degrees Celsius?

Is it 30 degrees Celsius outside?

Famille de mots

Noms

Adjectifs

Apparenté

Comment l'utiliser

frequency

Extremely high in global English, lower in American English.

Erreurs courantes

Writing 'celcius' with a lowercase 'c'. → Celsius
Celsius is a proper noun named after Anders Celsius and must always be capitalized.
Saying 'one degrees Celsius'. → one degree Celsius
The word 'degree' should be singular when the number is exactly one.
Using 'centigrade' in a modern scientific paper. → Celsius
While centigrade is understood, Celsius has been the official and preferred term since 1948.
Confusing 0°C with 0°F. → 0°C is freezing; 0°F is much colder.
0°C is the freezing point of water, but 0°F is about -18°C. This is a common conceptual error for learners.
Placing the degree symbol after the C (e.g., 20 C°). → 20 °C
The degree symbol should come before the 'C' when indicating a specific temperature.

Astuces

The 'S' at the end

Always remember that Celsius ends with an 's'. Many people want to put a 'c' there because of the 'C' at the beginning, but it is always 'sius'.

Zero is Plural

In English, we say 'zero degrees Celsius'. Even though zero represents nothing, the word 'degrees' must be plural. Only 'one degree' is singular.

Quick Weather Hack

For a quick, rough conversion from Celsius to Fahrenheit for weather: double the Celsius number and add 30. It's not perfect, but it's close enough for choosing clothes!

Capitalize Always

In professional emails or reports, failing to capitalize Celsius can look sloppy. Treat it like a name, because it is one!

International Travel

If you are traveling outside the US, set your phone's weather app to Celsius a week before you leave. This will help your brain adjust to the new numbers.

Oven Temperatures

Be careful with recipes! If a recipe says 350 degrees, it's almost certainly Fahrenheit. 350 degrees Celsius would burn your food (and maybe your kitchen) instantly!

Fever Check

Remember the number 38. In Celsius, 38 is the magic number where a 'warm' temperature becomes a 'fever' that might need attention.

Kelvin Connection

If you are studying science, remember that the 'size' of a degree Celsius is the same as a Kelvin. This makes math much easier in thermodynamics.

Symbol Shortcut

On most keyboards, you can type the degree symbol (°) by holding Alt and typing 0176 on the number pad. Then just add a capital C!

Listen for 'Minus'

When listening to weather reports, the word 'minus' is very important. 'Five degrees' and 'minus five degrees' are very different experiences!

Mémorise-le

Moyen mnémotechnique

Remember 'C' for Celsius and 'C' for Cold (0°C is freezing) and 'C' for Cook (100°C is boiling). Also, think of the 'S' in Celsius as standing for 'Standard' because it is the standard scale for the world.

Association visuelle

Visualize a thermometer with a big 'C' at the top. At the bottom, imagine an ice cube next to the number 0. At the top, imagine a steaming cup of tea next to the number 100. This links the numbers to physical states of water.

Word Web

Temperature Weather Science Metric Degree Thermometer Freezing Boiling

Défi

Try to guess the temperature in Celsius every time you walk outside for a week. Check your phone to see how close you were. This will help you build an intuitive sense of the scale.

Origine du mot

The word is named after Anders Celsius, a Swedish astronomer who lived from 1701 to 1744. He proposed the scale in a paper to the Royal Society of Sciences in Uppsala in 1742. Interestingly, his original scale was the reverse of what we use today: he set 0 as the boiling point and 100 as the freezing point.

Sens originel : The name 'Celsius' is a Latinized form of the Swedish surname 'Högen', which refers to a high place or mound. It became the official name of the temperature scale in 1948.

Indo-European (via Swedish and Latin).

Contexte culturel

Be aware that using Celsius in the US might cause confusion in casual settings, while using Fahrenheit in Europe or Asia might make you seem out of touch with local standards.

While the UK and Canada have officially adopted Celsius, older generations may still use Fahrenheit in casual conversation. The US remains the only major English-speaking country to use Fahrenheit as its primary scale.

The book 'Fahrenheit 451' by Ray Bradbury (often compared to Celsius 233). Weather reports on the BBC and other international English news outlets. The Paris Agreement on climate change, which uses Celsius as its primary metric.

Pratique dans la vie réelle

Contextes réels

Weather Forecasting

High of 25 Celsius
Low of 10 Celsius
Temperature in Celsius
Degrees Celsius

Cooking and Baking

Preheat to 180 Celsius
Bake at 200 Celsius
Celsius oven settings
Internal temperature in Celsius

Medical Health

Fever of 39 Celsius
Normal body temperature in Celsius
Celsius thermometer
Temperature reading in Celsius

Scientific Research

Measured in Celsius
Celsius scale
Standardized to Celsius
Celsius gradient

Travel and Tourism

Local temperature in Celsius
Celsius to Fahrenheit conversion
Celsius weather icons
Understanding Celsius

Amorces de conversation

"Do you prefer to use Celsius or Fahrenheit when you check the weather?"

"What is the hottest temperature in Celsius you have ever experienced?"

"Is it easy for you to convert Celsius to Fahrenheit in your head?"

"At what temperature in Celsius do you usually set your air conditioner?"

"Do you think the whole world should use Celsius for everything?"

Sujets d'écriture

Describe a day when the temperature was below zero degrees Celsius. What did you do to stay warm?

Write about a time you were confused by a temperature reading in Celsius while traveling.

Explain why you think the Celsius scale is more or less logical than the Fahrenheit scale.

Imagine a world where temperature is measured in a completely new way. How would it compare to Celsius?

Discuss the importance of the Celsius scale in the context of global climate change reporting.

Questions fréquentes

10 questions

It is named after Anders Celsius, the Swedish astronomer who invented the scale in 1742. The name was officially adopted in 1948 to honor his contribution to science and to provide a unique name for the scale that wouldn't be confused with other measurements.

There is no numerical difference; they refer to the same scale. 'Centigrade' was the original name, meaning '100 steps'. It was renamed 'Celsius' in 1948 to avoid confusion with the 'grade' unit of angle and to follow the convention of naming units after scientists.

To convert Celsius to Fahrenheit, multiply the temperature by 1.8 (or 9/5) and then add 32. For example, to convert 20°C: (20 x 1.8) + 32 = 36 + 32 = 68°F. This is a common calculation for travelers.

Yes, 0 degrees Celsius is the freezing point of water. At this temperature, ice begins to form, and it is considered very cold for weather. You would typically need a heavy coat, gloves, and a hat to be comfortable outside.

The average normal body temperature is generally accepted as 37 degrees Celsius (98.6 degrees Fahrenheit). However, a normal range can be anywhere from 36.1°C to 37.2°C. A temperature above 38°C is usually considered a fever.

Yes, always capitalize the 'C' in Celsius. It is a proper noun because it is derived from the name of a person, Anders Celsius. This rule applies even when it is used as an adjective, such as in 'the Celsius scale'.

Almost every country in the world uses Celsius as its primary temperature scale. The main exceptions are the United States, the Bahamas, the Cayman Islands, Liberia, Palau, and the Federated States of Micronesia, which still use Fahrenheit.

The symbol is a small raised circle followed by a capital C: °C. In most professional writing, there is a space between the number and the symbol (e.g., 25 °C), though some casual styles omit the space (e.g., 25°C).

Absolute zero, the lowest possible temperature where all molecular motion stops, is -273.15 degrees Celsius. This point is the starting point (0 K) for the Kelvin scale, which is used extensively in physics and chemistry.

Celsius is used because it is part of the metric system (SI), which is based on powers of ten and is the international standard for scientific measurement. Its logical reference points (0 for freezing, 100 for boiling) make it easy to use in calculations.