But in certain landfills, including some accepting the BP cleanup, waste,heat and methane gas produced by decomposition are being used to generate energy.

VOA: standard.2010.08.05

When I flail my arms around I generate work and heat. This is not a constant volume process.

这不是一个恒容过程,但如果我是一个系统，当我做这些的时候。

麻省理工公开课 - 热力学与动力学课程节选