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When a system is considered in two different states, the difference in volume or in any other property, between the two states, depends solely upon those states themselves and not upon the manner in which the system may pass from one state to the other.

当一个系统处于两种不同的状态时，两种状态之间的体积或任何其他性质的差异只取决于这些状态本身，而不取决于系统从一种状态传递到另一种状态的方式。

— Rudolf Arnheim 鲁道夫·阿恩海姆