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pv图如何表示做功正负

更新时间: 2020-09-20 00:00:00     

如果过程是沿曲线向横坐标正向走的,就作正功,反之做负功。

热力学基础里的pv图,曲线与横轴围成的面积就等于做功。如果曲线上有些段沿正向、有些段沿负向,分别计算各段对应的面积,看正负方向哪个更大。例如如果曲线刚好形成一个回路,沿回路顺时针走一圈的就是对外做正功,逆时针的就是做负功,且回路围成的面积就等于做功的数值。

关键词: pv 如何 表示 做功 正负

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