Air Is All Around You

AIR Is ALL AROUND You

你四周都是空气

Air is all around you. There is air down in a deep valley. There is air around a high mountain. Wherever you go, there is air. Cars and houses are filled with it. So are barns, sheds, doghouses and birdhouses.

你四周都是空气。深深的山谷里，高高的山顶上，无论你到哪里，到处都有空气。 汽车和房屋里充满了空气，谷仓、工棚、狗屋和鸟笼里也一样。

Cups are full of it. So are bowls, pots and glassesthat we drink out of.

空茶杯里充满了空气，锅碗瓢盆里也一样。

That's hard to believe because you can't see the air or smell it. You can't feel it either, except when it's moving. Or when youspin around.

这的确很难相信，因为你看不见也闻不到空气，除非它在流动，或者你在转圈，否则你感觉不到空气的存在。

You can't see the air in a glass, but you canprove it is there. Try this experiment. Run a lot of water into the sink. Or put water in a big bowl. Colorthe water with a little food coloring. Not much, just enough to color it alittle bit. Stuff a paper napkin into the bottomof a glass. Turn the glass upside down. If the napkin falls out, stuff it in tighter.

虽然没办法看见玻璃杯里的空气，但我们能证明它确实存在，做个实验看看。 将水注入水槽或者大碗里，再加入几滴食用色素，不要太多，让水稍微变色就行了。 在玻璃杯底部塞一张餐巾纸，把杯子倒转过来，如果餐巾纸掉下来，就塞紧一点。

Keep the glass upside down. Makesure it is straight up and down. Donot tip it. Push it all the way underthe water. Or as far under as you can. Lift the glass out of the water. Turnit right side up and take out the papernapkin. It is dry. The water did nottouch it. The paper was under the water. But it did not get wet. Let's see why. Once again put the napkin in theglass. Turn the glass upside down, andpush it under the water. Look at the glass through the water. The water does not go into it. It can't go in because there is air inthe glass. But you can make the watergo in. Tip the glass a little bit. A bubble ofair goes out and up.

将倒立的玻璃杯垂直压入水中，小心别让它翻到，尽量压到碗底。 将玻璃杯从水中垂直抽出，翻转过来，拿出里面的餐巾纸。看，餐巾纸还是干的，一滴水都没碰到。 虽然餐巾纸被压入水中，但并没有浸湿，我们来看看这是怎么一回事。 将餐巾纸重新塞回杯子并倒转过来，垂直压入水中。仔细观察，水并没有进入玻璃杯。因为杯子里有空气，所以水进不去。 不过你也能让水进入杯子里。将玻璃杯稍稍倾斜，就有气泡从里面冒了上来。