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مستوى CEFR
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الترجمة (108 مقاطع)
Hey, Vsauce Michael here coming to you from my hotel room in London
with a little camera that I taped to a bunch of furniture I stacked up.
Which is better than nothing, and as you can tell from the title of this video,
it's also what we're going to discuss.
Nothing.
Can there ever be nothing? I mean, we're surrounded by matter all the time.
Even this glass is not empty.
I know you might think there's nothing in it, but it's full of air.
And air is packed.
One cubic centimeter of air contains almost
30 quintillion molecules.
But if I remove the air from this glass,
I can create what is known as a vacuum,
an awesome word that uses a double u, but not a w.
The challenge, however, is removing all of the air.
To this day, the best scientists have been able to do
is to create what they call an ultra-high vacuum.
At this point, one cubic centimeter
of space contains not 30 quintillion molecules,
but a mere and amazing 100.
To put that in perspective, a vacuum cleaner
like you use at home hardly changes the thinness of the air at all.
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