这里发生了膨胀,所以系统对外界做功，活塞被推出来。
Here there's an expansion going on, so the system is doing work to the external world.
热力学在问你们，到底是系统对环境做功，还是环境对系统做功？
Thermodynamics is asking you, what work does this thing do on the surroundings or the surroundings do on the system?
那么是这个系统向外界做功呢,还是外界向系统做功呢？
So is this system doing work on the surroundings or are the surroundings doing work on the system?
系统对环境做功，因此符号是负的。
So, the system does work on the surroundings, hence the minus sign.
这样，应用等效热降的法则，不但可以计算热力系统局部参数及系统变化时单位新蒸汽做功的变化，还可以计算这些局部参数变动所引起的上述其它参数变化量。
This new method can be used to calculate the changes in the work done by fresh steam while the thermal system and any local parameters vary. Two examples are given to check the algorithm.
这样，应用等效热降的法则，不但可以计算热力系统局部参数及系统变化时单位新蒸汽做功的变化，还可以计算这些局部参数变动所引起的上述其它参数变化量。
This new method can be used to calculate the changes in the work done by fresh steam while the thermal system and any local parameters vary. Two examples are given to check the algorithm.
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