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bingle (bingle)
被子的重量 = 引力(地球) - 浮力(空气)

抽去空气的被子质量减小,引力减小;
同时体积减小,浮力减小;

所以重量不变?

高中物理已经快忘光了,唯一记得的就是质量和重量不是一个概念。
:(
(#29339@0)
2001-2-28 -04:00
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Back To Topic: 原来空气没重量!我一条12斤的被子,抽成真空还是12斤!

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