一壶水烧开后,壶盖被顶开,这是因为(    )  A.水分子运动速

一壶水烧开后,壶盖被顶开,这是因为(   

 A.水分子运动速度快,撞开壶盖              B.水分解成氢气和氧气

 C.水由液态变成气态,分子间隔增大,体积膨胀   D.水分子分成氢原子和氧原子后粒子数目增多

答案

C

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