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نم نسبی

B1 noun #7,500 most common 10 min read

نم نسبی

nam-e nesbi Top 7,500

Practice it Examples Notes & Tips نم نسبی in 30 Seconds

Explanation نم نسبی in your Level:

At the A1 level, you don't need to use the full phrase 'نم نسبی' (Relative Humidity) in complex ways. Instead, focus on the first part, 'نم' (Nam), which means moisture or dampness. Think of it as the 'wetness' of the air. At this stage, you might simply learn that when the air has 'nam', it feels different. You might hear a teacher say 'Hava nam darad' (The air has moisture). It is a basic building block for talking about the weather. You won't be expected to calculate percentages, but knowing that 'nam' is related to water in the air is a great start for your Persian journey.

At the A2 level, you can begin to use the full compound 'نم نسبی'. You will likely encounter it in simple weather reports. You should be able to recognize it when you hear it on the news or see it in a weather app. You can use it in basic sentences like 'Nam-e nasbi bala ast' (The relative humidity is high) or 'Nam-e nasbi kam ast' (The relative humidity is low). This level is about connecting the word to physical comfort, such as explaining why you are thirsty or why your skin feels dry. You are moving from just 'moisture' to the 'relative' concept, even if you don't fully understand the science behind it yet.

At the B1 level, you should be comfortable using 'نم نسبی' in various contexts, including health, environment, and basic science. You can explain how relative humidity affects daily life, such as its impact on hair, breathing, or the preservation of food. You should be able to use it with percentages, like 'Nam-e nasbi emruz panjah darsad ast' (The relative humidity today is 50 percent). You can also start to distinguish it from more general words like 'rotubat' (humidity) and understand that 'nam-e nasbi' is a more precise, scientific way of speaking. This is the level where you can participate in a discussion about the climate of different Iranian cities using this term.

At the B2 level, you use 'نم نسبی' with precision and can discuss its implications in more specialized fields. You might talk about its role in agriculture, industrial processes, or historical preservation. You can use complex sentence structures, such as 'If the relative humidity had been lower, the artifacts would not have been damaged.' You understand the nuances between 'nam-e nasbi' and 'rotubat-e nasbi' and can choose the appropriate one based on the register of the conversation. You are also able to understand news reports that discuss the 'dew point' and how it relates to the current relative humidity.

At the C1 level, 'نم نسبی' is a word you use fluently in academic, professional, and technical settings. You can read scientific journals in Persian that discuss atmospheric pressure, vapor saturation, and relative humidity without difficulty. You can use the term in metaphors or in high-level environmental policy discussions. You understand the historical development of the term in the Persian language and how it replaced or supplemented older, more poetic terms for atmospheric moisture. Your use of the word is indistinguishable from a native speaker who has a background in science or engineering.

At the C2 level, you have a masterly command of 'نم نسبی' and all its related concepts. You can discuss the thermodynamic principles behind relative humidity in Persian, using highly specialized vocabulary. You can critique technical translations that might misuse the term and provide nuanced explanations of its meaning in various dialects of Persian. You are comfortable using the term in any context, from a light-hearted joke about the weather in Mazandaran to a complex lecture on climate change. The term is no longer a 'vocabulary word' for you; it is a precise tool in your vast linguistic repertoire.

Practice it Examples Notes & Tips

نم نسبی in 30 Seconds

Relative humidity (نم نسبی) is a scientific term used to measure the percentage of moisture in the air relative to its saturation point.
It is a compound of 'Nam' (moisture) and 'Nasbi' (relative), used frequently in Iranian weather reports and technical documents.
The term is essential for understanding physical comfort, as high humidity makes heat feel more intense and low humidity causes dryness.
Grammatically, it is a noun-adjective pair connected by an ezafe, and it is almost always followed by a percentage value in Persian.

The term نم نسبی (pronounced 'Nam-e Nasbi') is a technical yet common compound noun in Persian that translates directly to relative humidity. To understand this word, one must look at its two components: نم (nam), which means moisture, dampness, or humidity, and نسبی (nasbi), which means relative or proportional. In everyday Persian, while people might just say 'hava martub ast' (the air is humid), the specific phrase نم نسبی is used when discussing weather forecasts, health conditions, or the preservation of delicate items like carpets or manuscripts. It refers to the amount of water vapor present in the air compared to the maximum amount the air could hold at that specific temperature, expressed as a percentage.

Meteorological Context: In weather reports across Iran, from the humid shores of the Caspian Sea to the dry deserts of Yazd, نم نسبی is a key metric. It explains why 30 degrees Celsius in Rasht feels much more oppressive than 30 degrees in Tehran. High relative humidity prevents sweat from evaporating, making the 'felt' temperature much higher.

امروز نم نسبی در شهرهای ساحلی شمال به نود درصد رسیده است.

Translation: Today, the relative humidity in northern coastal cities has reached ninety percent.

Beyond meteorology, this term is crucial in industrial and domestic settings. For instance, in the famous Persian carpet weaving workshops, maintaining a specific نم نسبی is vital to ensure the silk and wool fibers do not become too brittle or too elastic. Similarly, in the modern Iranian household, people use dehumidifiers or humidifiers to control the نم نسبی for respiratory health, especially during the dry winters of the plateau or the sweltering summers of the south.

Scientific Precision: Scientists distinguish between absolute humidity (رطوبت مطلق) and relative humidity (نم نسبی). While 'rotubat' is a more common word for humidity in general, 'nam' is often preferred in specific scientific compounds to denote the presence of moisture in a more tactile or measurable sense.

In literary or poetic contexts, 'nam' alone carries a weight of freshness or sadness (like 'nam-e chashm' for the moisture of eyes/tears), but when paired with 'nasbi', it moves strictly into the realm of science and objective observation. This transition from a poetic root to a scientific term is a hallmark of how modern Persian adapts traditional vocabulary for technical precision. Understanding this word helps learners navigate formal documents, news, and technical discussions about the environment, architecture, and health in the Persian-speaking world.

Using نم نسبی correctly requires an understanding of its role as a compound noun. It functions as the subject or object in sentences related to measurement, environment, and physical comfort. Because it is a technical term, it is frequently paired with verbs like اندازه‌گیری کردن (to measure), افزایش یافتن (to increase), or کاهش یافتن (to decrease). It is also commonly used with the verb بودن (to be) to describe the state of the atmosphere.

برای نگهداری بهینه از کتاب‌های خطی، نم نسبی کتابخانه باید روی پنجاه درصد تنظیم شود.

Translation: For optimal preservation of manuscripts, the relative humidity of the library must be set at fifty percent.

When talking about personal comfort, you might use it to explain why a certain temperature feels hotter than it is. In Persian grammar, the 'ezafe' construction (the short 'e' sound) connects 'nam' and 'nasbi'. Note that in formal writing, 'rotubat-e nasbi' is a very common synonym, but 'nam-e nasbi' is frequently found in technical manuals and specific meteorological reports. The word 'nasbi' is an adjective modifying 'nam', and it always follows the noun in this construction.

Common Verb Pairings

بالا رفتن (Bālā raftan): To rise (Relative humidity is rising).
ثابت نگه داشتن (Sābet negah dāshtan): To keep constant.
تاثیر گذاشتن (Tāsir gozāshtan): To affect/influence.

اگر نم نسبی هوا خیلی کم باشد، پوست انسان خشک می‌شود.

Translation: If the relative humidity of the air is very low, human skin becomes dry.

In more complex sentences, نم نسبی can be part of a conditional clause. For example, 'If the relative humidity reaches 100%, it will rain.' This involves using the subjunctive mood in Persian: 'Agar nam-e nasbi be sad darsad berasad...'. This usage demonstrates that while the word itself is B1 level, the structures surrounding it can range from simple descriptions to complex scientific hypotheses. It is also important to note that 'nam' is a more 'physical' word for moisture than 'rotubat', often implying a slight dampness you can feel on a surface, which is why it's so evocative when used in the context of air quality.

Finally, when using this word in a professional setting, such as an engineering report or a medical consultation regarding asthma, ensure that the numbers are followed by the word 'darsad' (percent). For example: 'Nam-e nasbi-ye in otagh shast darsad ast' (The relative humidity of this room is 60 percent). The addition of the 'ye' after 'nasbi' is the ezafe required when a word ends in a long 'i' vowel and is followed by another word (like 'ast').

If you are living in or visiting Iran, the most likely place you will encounter نم نسبی is during the nightly news weather forecast. The meteorologist will stand in front of a digital map of Iran and list the temperatures and نم نسبی for various provincial capitals. In cities like Bandar Abbas or Bushehr, this figure is often the most discussed part of the weather, as it dictates the 'sharji' (sultry/humid) conditions that define life in the south. You will hear phrases like 'nam-e nasbi-ye bala' (high relative humidity) constantly in these regions during the summer months.

گزارشگر هواشناسی گفت که نم نسبی فردا کاهش می‌یابد.

Translation: The weather reporter said that the relative humidity will decrease tomorrow.

Another common location is in the world of Iranian architecture and construction. Given the diverse climates of Iran—from the humid north to the arid center—architects must account for نم نسبی to prevent mold or structural damage. You might hear construction workers or engineers discussing the 'nam' of a building's basement or the 'nam-e nasbi' required for a specific type of cement to cure properly. In the historic houses of Kashan or Yazd, the ancient 'badgirs' (windcatchers) were designed specifically to manage the air's temperature and نم نسبی through natural ventilation and water evaporation.

Health and Wellness: In Iranian hospitals and clinics, doctors often advise patients with respiratory issues (like asthma) to monitor the نم نسبی of their homes. If the air is too dry (low relative humidity), it can irritate the lungs; if it is too high, it can encourage the growth of allergens.

You will also find this term in Iranian schools during geography or science classes. Students learn the physics of the water cycle and how نم نسبی relates to the dew point (noghte-ye shabnam). This academic exposure ensures that most educated Persian speakers are familiar with the term, even if they don't use it in casual conversation every day. In casual talk, they might say 'hava kheyli nam dareh' (the air has a lot of moisture), but as soon as the conversation turns slightly more serious or precise, they switch to نم نسبی.

در گلخانه‌های صنعتی، کنترل نم نسبی برای رشد گیاهان ضروری است.

Translation: In industrial greenhouses, controlling the relative humidity is essential for plant growth.

Lastly, in the digital age, Persian-language weather apps and websites are ubiquitous. When an Iranian checks their phone for the weather, they see a percentage next to an icon of a water drop, labeled as نم نسبی. This constant visual reinforcement makes the term a staple of the modern Persian vocabulary, bridging the gap between high science and daily routine.

One of the most frequent mistakes learners make is confusing نم نسبی with رطوبت مطلق (absolute humidity). While they both deal with water vapor, they are measured differently. Learners often use 'nam' and 'rotubat' interchangeably. While this is generally acceptable in casual speech, in a technical or academic context, 'Nam-e Nasbi' is the specific term for the percentage-based measurement. Using 'rotubat' to describe a specific percentage can sometimes sound slightly less precise, though it is not grammatically 'wrong'.

The Ezafe Mistake: Many students forget the 'ezafe' (the link-vowel) between 'Nam' and 'Nasbi'. They might say 'Nam Nasbi' as two separate words. It must be pronounced Nam-e Nasbi. Without the ezafe, the phrase loses its grammatical connection and sounds like a list of two unrelated words: 'Moisture, Relative'.

Another common error involves the word order. Because English puts the adjective 'relative' before the noun 'humidity', English speakers often want to say 'Nasbi Nam'. In Persian, adjectives almost always follow the noun they modify. Therefore, it is always 'Nam' (Noun) + 'Nasbi' (Adjective). Reversing this is a tell-tale sign of a non-native speaker. Furthermore, when the phrase is followed by a verb like 'is' (ast), learners often forget the 'ye' connector: Nam-e nasbi ast is incorrect; it should be Nam-e nasbi-ye inja... or Nam-e nasbi bala-st.

اشتباه: نسبی نم هوا زیاد است. درست: نم نسبی هوا زیاد است.

Contextual misuse is also a factor. Learners might use نم نسبی to describe a wet surface, like a floor that was just mopped. This is incorrect. For a wet surface, one should use 'khis' (wet) or 'nam-nak' (damp). Nam-e nasbi refers specifically to the water vapor in the atmosphere, not the liquid water on an object. Using it for a wet towel would sound very strange and overly scientific, much like saying 'the relative humidity of this towel is high' in English instead of 'this towel is damp'.

Pronunciation Pitfalls: The word 'Nasbi' has a 's' sound (written with the letter Sad - ص). Some learners might mispronounce it with a 'sh' sound or fail to emphasize the 'i' at the end. The 'i' should be long and clear: Nas-BEE. Also, the 'a' in 'Nam' is a short 'a' (like 'cat'), not a long 'aa'.

Finally, when writing, ensure you use the correct Persian letters. 'Nam' is spelled (نون میم) and 'Nasbi' is (نون صاد ب ی). Using the wrong 's' (like Sin س or Se ث) is a common spelling mistake for beginners, as all three make the same 's' sound in modern Persian, but 'Nasbi' specifically uses 'Sad'.

While نم نسبی is the technical standard, several other words in Persian describe similar concepts of wetness and moisture. Understanding the nuances between these can greatly improve your fluency. The most direct alternative is رطوبت نسبی (Rotubat-e Nasbi). 'Rotubat' is the Arabic-rooted word for humidity and is used almost interchangeably with 'Nam' in formal and scientific contexts. However, 'Nam' often feels slightly more 'Persian' and is frequently used in meteorological contexts specifically.

Comparison: Nam vs. Rotubat

نم (Nam): Often implies a light, palpable moisture. It's used for the dampness of the earth after a light rain or the moisture in the air. It feels more 'natural'.

رطوبت (Rotubat): A broader, more formal term. It can refer to humidity in the air, but also the dampness in the walls of an old building (which is a negative thing in Persian culture, known as 'rotubat-e divar').

در شمال ایران، رطوبت نسبی بسیار بالاست، اما مردم محلی بیشتر از کلمه «شرجی» استفاده می‌کنند.

Translation: In northern Iran, relative humidity is very high, but locals mostly use the word 'Sharji'.

Another important word is شرجی (Sharji). This is an adjective used specifically to describe weather that is both hot and extremely humid, typical of the Persian Gulf coast. While نم نسبی is the measurement (e.g., 90%), sharji is the feeling. You wouldn't say 'the relative humidity is sharji', but you would say 'the weather is sharji because the relative humidity is high'.

Other Related Terms

نمناک (Nam-nak): Damp or moist (usually describing an object like soil or a cloth).
خیس (Khis): Wet or soaked (saturated with liquid).
شبنم (Shabnam): Dew (the actual droplets that form when relative humidity reaches saturation).

In technical literature, you might also see میزان بخار آب (mizan-e bokhar-e ab), which means 'amount of water vapor'. This is the raw data that determines the نم نسبی. If you are translating a scientific paper, you might use 'Nam-e Nasbi' for the percentage and 'Rotubat-e Motlagh' for the actual mass of water vapor per volume of air. For learners, mastering 'Nam-e Nasbi' provides a solid foundation for discussing climate, science, and comfort with precision, while knowing 'Sharji' and 'Nam-nak' allows for more colorful, natural expression in daily life.

How Formal Is It?

Formal

"نم نسبی در این منطقه به حد اشباع رسیده است."

Neutral

"نم نسبی امروز چقدر است؟"

Informal

"هوا خیلی نم داره، خیس عرق شدیم."

Child friendly

"بچه‌ها، وقتی نم نسبی زیاد بشه، ممکنه بارون بیاد."

Slang

"عجب نمی داره هوا!"

Fun Fact

The word 'Nam' is a cognate with the English word 'damp' if you go far back enough in Indo-European roots, though they evolved differently. In Persian poetry, 'Nam' is often used to describe the freshness of a garden or the sadness of a tear.

Pronunciation Guide

UK /næm eɪ næsbiː/

US /næm eɪ næsbi/

The stress falls on the final syllable of 'Nasbi' (nas-BEE). There is also a secondary stress on 'Nam'.

Rhymes With

کسبی (Kasbi - earned) حسبی (Hasbi - by means of) عصبی (Asabi - nervous) مذهبی (Mazhabi - religious) ادبی (Adabi - literary) عربی (Arabi - Arabic) غربی (Gharbi - western) قلبی (Ghalbi - of the heart)

Common Errors

Pronouncing 'Nasbi' as 'Nashbi' (using a 'sh' sound).
Omitting the 'e' (ezafe) between the two words.
Pronouncing the 'a' in 'Nam' like the 'a' in 'father' instead of 'cat'.

Difficulty Rating

Reading 3/5

The words are simple, but the compound is technical. Most B1 learners can read it easily in context.

Writing 4/5

Spelling 'Nasbi' with the correct 'Sad' (ص) can be tricky for beginners.

Speaking 3/5

The ezafe 'e' sound must be clear to sound natural.

Listening 3/5

Very common on news broadcasts, making it good for practice.

What to Learn Next

Prerequisites

نم (Moisture) نسبت (Ratio) هوا (Air) درصد (Percent) زیاد/کم (A lot/Little)

Learn Next

نقطه شبنم (Dew point) فشار جو (Atmospheric pressure) تبخیر (Evaporation) اقلیم (Climate) هواشناسی (Meteorology)

Advanced

ترمودینامیک (Thermodynamics) ظرفیت گرمایی (Heat capacity) فشار بخار (Vapor pressure) آنتروپی (Entropy) میکروکلیم (Microclimate)

Grammar to Know

The Ezafe Construction

نمِ نسبی (Nam-e Nasbi) - The short 'e' links the noun and adjective.

Adjective Agreement

نم‌های نسبی (Nam-ha-ye nasbi) - The adjective 'nasbi' stays the same even if the noun were plural (though plural is rare here).

Percent Usage

هفتاد درصد (70 percent) - The number comes before the word 'darsad'.

Subjunctive with 'Agar' (If)

اگر نم نسبی بالا برود، باران می‌بارد. (If relative humidity goes up, it rains.)

Compound Nouns with 'Nasbi'

سرعت نسبی (Relative speed), فقر نسبی (Relative poverty).

Examples by Level

هوا کمی نم دارد.

The air has a little moisture.

Simple subject-object-verb structure using 'nam' as moisture.

امروز نم هوا زیاد است.

Today the air moisture is a lot.

'Nam' is used here as a simple noun for moisture.

این اتاق نم دارد.

This room has moisture/dampness.

Common way to describe a damp room.

نم برای گل‌ها خوب است.

Moisture is good for flowers.

'Nam' used as the subject of the sentence.

دریا نم زیادی دارد.

The sea has a lot of moisture.

Linking 'nam' to a geographic location.

من نم را دوست دارم.

I like moisture/dampness.

Simple expression of preference.

نم هوا کم است.

The air moisture is low.

Using 'kam' (low/little) to describe 'nam'.

آیا هوا نم دارد؟

Does the air have moisture?

Simple question structure.

نم نسبی امروز چقدر است؟

What is the relative humidity today?

Using 'cheghadr' (how much) to ask about the measurement.

نم نسبی در شمال زیاد است.

Relative humidity is high in the north.

Locating the concept in a specific geographic context.

نم نسبی هوا شصت درصد است.

The relative humidity of the air is sixty percent.

Introducing the use of percentages with the term.

وقتی نم نسبی بالا است، هوا گرم‌تر به نظر می‌رسد.

When the relative humidity is high, the air seems hotter.

Using a 'vaghti' (when) clause to show cause and effect.

نم نسبی برای پوست مفید است.

Relative humidity is useful for the skin.

Discussing a benefit of the concept.

او نم نسبی را در اخبار شنید.

He heard the relative humidity on the news.

Using the verb 'shenidan' (to hear) with the term.

نم نسبی در بیابان خیلی کم است.

Relative humidity in the desert is very low.

Comparing different environments.

ما به نم نسبی نیاز داریم.

We need relative humidity.

Expressing a need for controlled humidity.

نم نسبی ایده‌آل برای خانه بین چهل تا پنجاه درصد است.

The ideal relative humidity for a home is between forty to fifty percent.

Using 'ide-al' (ideal) and ranges of percentages.

اگر نم نسبی خیلی زیاد باشد، ممکن است کپک رشد کند.

If the relative humidity is too high, mold might grow.

Conditional sentence using 'agar' (if) and 'momken ast' (it's possible).

دستگاه هواساز نم نسبی را کنترل می‌کند.

The HVAC system controls the relative humidity.

Using technical verbs like 'kontrol kardan' (to control).

تغییرات نم نسبی باعث درد مفاصل می‌شود.

Changes in relative humidity cause joint pain.

Using 'ba'es shodan' (to cause) to show a health link.

نم نسبی در گلخانه باید همیشه ثابت بماند.

The relative humidity in the greenhouse must always remain constant.

Using 'bayad' (must) and 'sabet mandan' (to remain constant).

در این فصل، نم نسبی به طور ناگهانی تغییر می‌کند.

In this season, the relative humidity changes suddenly.

Using adverbs like 'be tor-e nagahani' (suddenly).

او درباره نم نسبی در کلاس جغرافیا تحقیق کرد.

She researched relative humidity in geography class.

Using 'tahghigh kardan' (to research).

نم نسبی پایین باعث خشکی گلو می‌شود.

Low relative humidity causes throat dryness.

Linking low humidity to a physical symptom.

نم نسبی بر میزان تبخیر از سطح دریاچه‌ها تأثیر می‌گذارد.

Relative humidity affects the evaporation rate from lake surfaces.

Using 'ta'sir gozashtan' (to affect) with specific scientific subjects.

برای کالیبره کردن سنسور، باید نم نسبی محیط را بدانیم.

To calibrate the sensor, we must know the ambient relative humidity.

Using technical vocabulary like 'kalibre kardan' (to calibrate).

نم نسبی صد درصد به معنای اشباع کامل هوا از بخار آب است.

One hundred percent relative humidity means the air is completely saturated with water vapor.

Defining a scientific state using 'be ma'na-ye' (means).

نوسانات نم نسبی می‌تواند به آثار باستانی آسیب برساند.

Fluctuations in relative humidity can damage ancient artifacts.

Using 'nosanat' (fluctuations) and 'asib resandan' (to damage).

در فرآیندهای صنعتی، کنترل دقیق نم نسبی حیاتی است.

In industrial processes, precise control of relative humidity is vital.

Using 'hayati' (vital) and 'daghigh' (precise).

نم نسبی با افزایش دما کاهش می‌یابد، به شرطی که فشار ثابت باشد.

Relative humidity decreases with increasing temperature, provided pressure is constant.

Using 'be sharti ke' (provided that) for scientific conditions.

پزشک توصیه کرد که نم نسبی اتاق بیمار را افزایش دهیم.

The doctor recommended that we increase the relative humidity of the patient's room.

Using 'tosiye kardan' (to recommend) with a subjunctive clause.

نم نسبی بالا در تابستان باعث ایجاد حالت شرجی می‌شود.

High relative humidity in summer creates 'sharji' (sultry) conditions.

Linking the technical term to the cultural term 'sharji'.

تحلیل الگوهای نم نسبی برای پیش‌بینی دقیق طوفان‌ها ضروری است.

Analyzing relative humidity patterns is essential for accurate storm prediction.

Using 'tahlil' (analysis) and 'pish-bini' (prediction).

نم نسبی یکی از پارامترهای کلیدی در مدل‌سازی اقلیمی محسوب می‌شود.

Relative humidity is considered one of the key parameters in climate modeling.

Using 'mahsoub shodan' (to be considered) in a formal way.

تأثیر متقابل دما و نم نسبی بر آسایش حرارتی انسان پیچیده است.

The interaction between temperature and relative humidity on human thermal comfort is complex.

Using 'ta'sir-e motaghabel' (interaction/mutual effect).

در صنایع داروسازی، حفظ نم نسبی در محدوده مجاز اجباری است.

In the pharmaceutical industry, maintaining relative humidity within the permitted range is mandatory.

Using 'mahdoude-ye mojaz' (permitted range) and 'ejbari' (mandatory).

تغییرات نم نسبی در لایه‌های مختلف جو بر شکل‌گیری ابرها اثر می‌گذارد.

Changes in relative humidity in different layers of the atmosphere affect cloud formation.

Discussing atmospheric layers ('laye-haye jav').

مطالعات نشان می‌دهند که نم نسبی بر طول عمر ویروس‌ها در هوا تأثیر دارد.

Studies show that relative humidity affects the lifespan of viruses in the air.

Using 'motale'at neshan midahand' (studies show).

نم نسبی پایین در کابین هواپیما می‌تواند منجر به کم‌آبی بدن شود.

Low relative humidity in aircraft cabins can lead to dehydration.

Using 'monjar be ... shodan' (to lead to).

بهینه‌سازی نم نسبی در انبارهای غلات مانع از فساد محصولات می‌شود.

Optimizing relative humidity in grain silos prevents product spoilage.

Using 'beine-sazi' (optimization) and 'mane' shodan' (to prevent).

عدم تقارن در توزیع نم نسبی در مقیاس جهانی پیامدهای اکولوژیکی عمیقی دارد.

Asymmetry in the global distribution of relative humidity has profound ecological consequences.

Using highly academic terms like 'adam-e taghayol' (asymmetry) and 'payamad' (consequence).

رابطه غیرخطی بین فشار بخار اشباع و دما، محاسبات نم نسبی را دشوار می‌کند.

The non-linear relationship between saturation vapor pressure and temperature makes relative humidity calculations difficult.

Using 'rabete-ye gheyr-e khati' (non-linear relationship).

پایداری نم نسبی در محیط‌های کنترل‌شده برای نانوتکنولوژی حیاتی است.

The stability of relative humidity in controlled environments is vital for nanotechnology.

Using 'paydari' (stability) in a technical context.

تغییرات اقلیمی باعث برهم خوردن تعادل تاریخی نم نسبی در برخی مناطق شده است.

Climate change has disrupted the historical balance of relative humidity in some regions.

Using 'bar-ham khordan-e ta'adol' (disruption of balance).

درک دقیق نم نسبی مستلزم تسلط بر مبانی ترمودینامیک کلاسیک است.

A precise understanding of relative humidity requires mastery of the fundamentals of classical thermodynamics.

Using 'mostalzem' (requires/entails) and 'tasallot' (mastery).

نم نسبی به عنوان یک متغیر حالت در تحلیل‌های هواشناسی پیشرفته به کار می‌رود.

Relative humidity is used as a state variable in advanced meteorological analyses.

Using 'motaghayyer-e halat' (state variable).

تأثیر نم نسبی بر ضریب شکست اتمسفر در مخابرات نوری حائز اهمیت است.

The effect of relative humidity on the atmospheric refractive index is significant in optical communications.

Using 'zarib-e shekast' (refractive index) and 'ha'ez-e ahammiyat' (significant).

پژوهشگران در حال بررسی نقش نم نسبی در فرآیندهای شیمیایی لایه استراتوسفر هستند.

Researchers are investigating the role of relative humidity in chemical processes in the stratosphere.

Using 'pazhouheshgaran' (researchers) and 'dar hal-e barresi' (investigating).

Common Collocations

نم نسبی بالا

نم نسبی پایین

اندازه‌گیری نم نسبی

کنترل نم نسبی

نم نسبی ایده‌آل

درصد نم نسبی

افزایش نم نسبی

کاهش نم نسبی

نم نسبی محیط

تغییرات نم نسبی

Common Phrases

نم نسبی چند درصد است؟

— Asking for the current humidity level.

ببخشید، نم نسبی امروز چند درصد است؟

هوا نم دارد.

— Saying the air feels moist or humid.

پنجره را باز کن، هوا نم دارد.

به خاطر نم نسبی بالا...

— Giving a reason based on humidity.

به خاطر نم نسبی بالا، لباس‌ها خشک نمی‌شوند.

نم نسبی را تنظیم کنید.

— Giving an instruction to change the humidity.

لطفاً نم نسبی دستگاه را روی چهل تنظیم کنید.

تأثیر نم نسبی بر سلامت

— Discussing the health effects of humidity.

در این مقاله درباره تأثیر نم نسبی بر سلامت بخوانید.

نم نسبی و نقطه شبنم

— A scientific phrase linking humidity and dew point.

رابطه بین نم نسبی و نقطه شبنم را توضیح دهید.

نم نسبی در فضای بسته

— Referring to indoor humidity.

نم نسبی در فضای بسته باید کنترل شود.

حسگر نم نسبی

— Referring to a humidity sensor.

حسگر نم نسبی خراب شده است.

نم نسبی متوسط

— Average relative humidity.

نم نسبی متوسط در تهران پایین است.

اوج نم نسبی

— Peak relative humidity.

اوج نم نسبی معمولاً در صبح زود است.

Often Confused With

نم نسبی vs رطوبت مطلق

Absolute humidity is the total mass of water vapor, while 'Nam-e Nasbi' is the percentage relative to saturation.

نم نسبی vs نقطه شبنم

Dew point is the temperature at which air becomes saturated, not the percentage of moisture.

نم نسبی vs نمک

Namak means salt. It sounds similar but is spelled differently and has no relation to moisture.

Idioms & Expressions

"نم پس ندادن"

— Literally 'not giving back moisture'. Idiomatically means being extremely stingy or secretive.

او حتی به صمیمی‌ترین دوستش هم نم پس نمی‌دهد.

Informal

"نم به چشم آوردن"

— To bring moisture to the eyes, meaning to make someone cry or feel very emotional.

این داستان غم‌انگیز نم به چشم همه آورد.

Literary

"نم‌نم باران"

— Drizzle or light rain. Not a scientific term but uses the root 'nam'.

عاشق قدم زدن در نم‌نم باران هستم.

General

"نانش در روغن است و نمش در آب"

— Literally 'his bread is in oil and his moisture is in water'. Means someone is living a very wealthy and comfortable life.

نگران او نباش، نانش در روغن است و نمش در آب.

Idiomatic

"نم‌گیر"

— Something that absorbs moisture. Also used for a small rug put near a sink.

یک نم‌گیر جدید برای آشپزخانه خریدم.

Daily Life

"نم کشیدن"

— To become damp or soggy (like cookies or crackers left out).

بیسکویت‌ها نم کشیده‌اند و دیگر ترد نیستند.

Informal

"نم‌زده"

— Damaged or marked by moisture.

دیوارهای زیرزمین نم‌زده هستند.

General

"بی‌نمک"

— Literally 'without salt', but often used for someone who isn't funny. (Note: unrelated to 'nam' but often confused by beginners due to spelling).

جوک‌های او خیلی بی‌نمک هستند.

Slang

"نمک‌گیر شدن"

— To be indebted to someone because of their hospitality. (Note: uses 'namak' salt, not 'nam').

من نمک‌گیر مهربانی شما شدم.

Cultural

"نمک روی زخم پاشیدن"

— To rub salt in a wound. (Note: uses 'namak').

با یادآوری شکستش، روی زخمش نمک نپاش.

Idiomatic

Easily Confused

نم نسبی vs نمناک

Both start with 'Nam'.

'Nam-e Nasbi' is an atmospheric measurement; 'Nam-nak' is an adjective describing a damp surface.

دیوار نمناک است اما نم نسبی اتاق خوب است.

نم نسبی vs نسبت

'Nasbi' is derived from 'Nesbat'.

'Nesbat' is the noun 'ratio/relation'; 'Nasbi' is the adjective 'relative'.

نسبت بخار آب به هوا تعیین‌کننده نم نسبی است.

نم نسبی vs مرطوب

Means humid/moist.

'Mortub' is an adjective for a place/thing; 'Nam-e Nasbi' is the noun for the measurement.

این شهر مرطوب است چون نم نسبی بالایی دارد.

نم نسبی vs خیس

Means wet.

'Khis' implies saturation with liquid water; 'Nam' implies vapor or light dampness.

لباس من خیس است، نه فقط نم‌دار.

نم نسبی vs شرجی

Both relate to humidity.

'Sharji' is a specific type of weather (hot+humid); 'Nam-e Nasbi' is a general scientific term.

وقتی هوا شرجی است، نم نسبی معمولاً بالای ۸۰ درصد است.

Sentence Patterns

نم نسبی [عدد] درصد است.

نم نسبی سی درصد است.

به دلیل نم نسبی بالا، [جمله].

به دلیل نم نسبی بالا، هوا گرم است.

[مکان] نم نسبی زیادی دارد.

شمال نم نسبی زیادی دارد.

نم نسبی بر [اسم] تأثیر می‌گذارد.

نم نسبی بر چوب تأثیر می‌گذارد.

برای کنترل نم نسبی، باید [فعل].

برای کنترل نم نسبی، باید پنجره را بست.

با افزایش [اسم]، نم نسبی کاهش می‌یابد.

با افزایش دما، نم نسبی کاهش می‌یابد.

تجزیه و تحلیل [اسم] و نم نسبی نشان می‌دهد که...

تجزیه و تحلیل اقلیم و نم نسبی نشان می‌دهد که...

Word Family

Nouns

Verbs

Adjectives

How to Use It

frequency

Common in technical, meteorological, and educational contexts.

Common Mistakes

Saying 'Nasbi Nam' → Nam-e Nasbi
In Persian, adjectives come after the noun. Reversing them is an English-influenced error.
Spelling 'Nasbi' as 'نسبي' with a Sin (س) → نسبی with a Sad (ص)
'Nasbi' is an Arabic-derived word and must use the original 'Sad'.
Omitting the Ezafe (Nam Nasbi) → Nam-e Nasbi
Without the linking 'e', the phrase is grammatically disconnected.
Using 'Nam-e Nasbi' for a wet floor → Zamin khis ast / Zamin nam darad
'Nam-e Nasbi' is an atmospheric term, not for liquid on surfaces.
Confusing 'Nam' with 'Namak' → Nam (Moisture) vs Namak (Salt)
They look similar but 'Namak' has an extra 'k' and a different meaning.

Tips

Master the Ezafe

The 'e' sound in 'Nam-e' is the glue of the Persian language. Practice saying 'Nam-e Nasbi' as one continuous flow of sound.

Know the Regions

In Iran, 'Shomal' (North) means high 'Nam-e Nasbi'. 'Yazd' or 'Kerman' means low 'Nam-e Nasbi'. Connecting words to geography helps memory.

Percentage Rule

Whenever you use 'Nam-e Nasbi', try to follow it with a number and 'darsad'. This reinforces the 'relative' (percentage) nature of the term.

The Water Drop

On weather apps, look for the water drop icon. The Persian text next to it will be 'نم نسبی'. This is the best real-world practice.

The Letter Sad

Associate 'Nasbi' with other 'Sad' words like 'Sabr' (patience). It takes 'patience' to understand 'relative' ratios!

Adjective Order

Always remember: Noun first, Descriptor second. 'Nam' (Humidity) + 'Nasbi' (Relative).

Nam = Damp

They sound similar and mean the same thing. This is a quick way to never forget the root.

News Practice

Watch 'Havashenasi' (weather) on IRIB or Persian news channels. They repeat 'Nam-e Nasbi' for every city.

Indoor Comfort

Think about your own home. Is the 'Nam-e Nasbi' high or low? Saying it about your environment makes it stick.

Nam vs Nasbi

Remember that 'Nam' is the thing, and 'Nasbi' is the type. Just like 'Speed' and 'Relative Speed'.

Memorize It

Mnemonic

Think of 'Nam' as 'Not Always Muddy' (just a little moisture). 'Nasbi' sounds like 'Necessary Ratio' (Nas-bi). So, Relative Humidity is the Necessary Ratio of moisture!

Visual Association

Imagine a glass of water that is only half full. The water is 'Nam' (moisture), and the fact that it is 50% full is 'Nasbi' (relative).

Word Web

Weather Climate Science Moisture Percentage Comfort Health Iran

Challenge

Try to find the 'Nam-e Nasbi' of your current city in Persian. Write it down as: 'Nam-e nasbi-ye [City Name] emruz [Number] darsad ast.'

Word Origin

'Nam' is a Middle Persian (Pahlavi) word meaning 'moisture'. 'Nasbi' is derived from the Arabic root 'N-S-B' (نسب), which relates to connection, relation, or ratio.

Original meaning: The original meaning of 'Nam' was simply wetness. 'Nasbi' entered Persian through Arabic scientific and philosophical influence to denote relative concepts.

Indo-European (Persian component) and Afro-Asiatic (Arabic component).

Cultural Context

No specific sensitivities. It is a neutral, scientific term.

In English, we often just say 'humidity'. In Persian, being specific with 'Nam-e Nasbi' shows a higher level of education or technical awareness.

Sohrab Sepehri, the famous poet, often used 'Nam' to describe the freshness of nature. Iranian National Radio weather updates are the most common place to hear this term daily.

Practice in Real Life

Real-World Contexts

Weather Forecast

نم نسبی افزایش می‌یابد (Relative humidity will increase)
نم نسبی در سواحل (Relative humidity on the coasts)
حداکثر نم نسبی (Maximum relative humidity)
کاهش محسوس نم نسبی (Noticeable decrease in relative humidity)

Health and Medicine

نم نسبی برای بیماران تنفسی (Relative humidity for respiratory patients)
خشکی هوا و نم نسبی (Air dryness and relative humidity)
استفاده از بخور (Using a humidifier)
نم نسبی مناسب اتاق (Suitable relative humidity for a room)

Museums and Libraries

حفاظت از آثار (Protection of artifacts)
نم نسبی ثابت (Constant relative humidity)
خسارت ناشی از رطوبت (Damage caused by humidity)
دیتالاگر نم نسبی (Relative humidity data logger)

Agriculture

نم نسبی خاک (Soil moisture/humidity)
رشد قارچ‌ها (Growth of fungi)
آبیاری و نم نسبی (Irrigation and relative humidity)
نم نسبی گلخانه (Greenhouse relative humidity)

HVAC and Engineering

سیستم تهویه (Ventilation system)
تنظیم نم نسبی (Adjusting relative humidity)
تراکم بخار آب (Condensation of water vapor)
سنسورهای دقیق (Precise sensors)

Conversation Starters

"آیا می‌دانستید نم نسبی در تهران معمولاً زیر بیست درصد است؟ (Did you know relative humidity in Tehran is usually below 20%?)"

"چرا نم نسبی بالا باعث می‌شود احساس گرمای بیشتری کنیم؟ (Why does high relative humidity make us feel hotter?)"

"به نظر شما نم نسبی ایده‌آل برای یک موزه چقدر باید باشد؟ (What do you think the ideal relative humidity for a museum should be?)"

"چطور می‌توانیم نم نسبی خانه را بدون دستگاه افزایش دهیم؟ (How can we increase home relative humidity without a device?)"

"آیا نم نسبی بر کیفیت صدای سازهای موسیقی تأثیر دارد؟ (Does relative humidity affect the sound quality of musical instruments?)"

Journal Prompts

امروز نم نسبی در شهر شما چطور بود و چه احساسی داشتید؟ (How was the relative humidity in your city today and how did you feel?)

توضیح دهید که چگونه نم نسبی بر زندگی روزمره مردم در شمال ایران تأثیر می‌گذارد. (Explain how relative humidity affects the daily lives of people in northern Iran.)

یک گزارش کوتاه درباره اهمیت کنترل نم نسبی در کتابخانه‌ها بنویسید. (Write a short report on the importance of controlling relative humidity in libraries.)

تجربه خود را از سفر به یک شهر با نم نسبی بسیار بالا توصیف کنید. (Describe your experience traveling to a city with very high relative humidity.)

رابطه بین نم نسبی و سلامتی خودتان را تحلیل کنید. (Analyze the relationship between relative humidity and your own health.)

Frequently Asked Questions

10 questions

'Nam' is Persian-rooted and often refers to palpable moisture or weather. 'Rotubat' is Arabic-rooted and is more formal, often used for dampness in buildings or general humidity. In the phrase 'Relative Humidity', both 'Nam-e Nasbi' and 'Rotubat-e Nasbi' are used, but 'Nam' is very common in meteorology.

You say: 'Nam-e nasbi panjah darsad ast.' (نم نسبی پنجاه درصد است).

Not usually. People usually say 'Hava martub ast' (The air is humid) or 'Hava nam darad'. You use 'Nam-e Nasbi' when you want to be precise, like when looking at a weather report.

Yes, in the context of physical science. However, in poetry, it can mean a small amount of anything liquid, like a tear or a drop of wine.

Because it comes from the Arabic root N-S-B (نسب). Persian uses several letters for the 's' sound, and you must memorize which one is used for which word.

Usually, for soil, we say 'Rotubat-e khak' or 'Nam-e khak'. 'Nam-e Nasbi' is almost exclusively for the atmosphere (air).

It can be. High humidity (above 60%) can encourage mold and dust mites, which affects asthma. Low humidity (below 30%) can dry out your skin and throat.

It is measured with a device called a 'Nam-sanj' (hygrometer).

Yes! If the temperature goes up but the amount of water vapor stays the same, the 'Nam-e Nasbi' goes down. This is why it's called 'relative'.

Usually, no. It is a 'hidden' vowel (ezafe) that you must know to pronounce. Sometimes a small mark (kasra) is written under the 'm' in 'Nam' to help learners.