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  I'm sure that you already tried to fill your bicycle tires with a hand pump. Do you remember if the tire valve and the pump were hot or cold when you finished? Why? Now, imagine that instead of a hand pump you use an air compressor. The air container cools or warms up? And the valve? Why?

If you know the answer, sends it by e-mail to Science at Home.

The applications are valid until 01/09/2004.

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