一定量的气体吸收热量,体积膨胀并对外做功,则此过程的末态与初

一定量的气体吸收热量,体积膨胀并对外做功,则此过程的末态与初态相比(    )

A.气体内能一定增加

B.气体内能一定减小

C.气体内能一定不变

D.气体内能是增是减不能确定

答案

解析:气体的内能是由热传递和做功共同决定的,现在吸收热量和对外做功同时进行,不知道具体的数值关系,因此无法判断.

答案:D

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