Name: TED-Ed】空氣有多重？- 丹-奎恩 (【TED-Ed】How heavy is air? - Dan Quinn)
Uploaded: 2021-01-14T05:05:20.000Z
Duration: 3 min 19 s
Description: 【看影片學英語】數萬部 YouTube 影片，搭配英漢字典即點即查，輕鬆掌握單字發音與用法，長久累積看電影不必再看字幕。

情態助動詞 B1

but from the moment you got out of bed today

to the point where you sat down to watch this video,

Why? Because air is a fluid just like water.

So why don't we notice it most of the time?

But while one cubic centimeter of interstellar space,

the volume in the tip of your pinky finger,

the same volume of air has about 10 quintillion molecules.

If that sounds hard to wrap your head around,

as the number of insects alive on the planet,

all crawling, climbing, and flying over each other

When this swarm of molecules runs into things,

it exerts a force, pressing against the boundaries of the fluid,

like water pressing against the glass of a bottle.

all those molecules still get pretty heavy,

with the total air filling a typical school gym,

weighing about as much as an adult elephant.

because most of it is pressing on the floor and the walls,

is pushed back by the pressure inside you!

You see, the air, as well as the water and everything else,

that fills our bodies exerts an amount of pressure

And we normally don't feel the air pressing on us

So even though different amounts of air molecules

that all those little differences average out.

What happens when air pressure isn't uniform?

This means that the molecules are pushing harder

driving the air flow from the higher pressure region

that meteorologists are always going on about

are responsible for other weather changes,

do more than just let us complain about the weather;

We breathe by lowering the pressure in our lungs,

think of the unfathomable number of air molecules

than there are grains of sand in all the world's beaches and deserts,

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TED-Ed】空氣有多重？- 丹-奎恩 (【TED-Ed】How heavy is air? - Dan Quinn)

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