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15问答网 > 水蒸气定温过程中内能和焓的变化是否为零

水蒸气定温过程中内能和焓的变化是否为零

2025-04-03 23:19:10

推荐回答（1个）

回答1：

不是。只有理想气体在定温过程中的热力学内能和焓的变化为零。

对于一般气体，内能变化dU=Tds-pdv，焓变dH=Tds+vdp，内能和焓都不仅与温度有关系还和压强p有关系。所以实际气体定温过程内能和焓变未必为0。水蒸气显然不能看作是理想气体，所以其内能和焓变不为0。

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