Or was it 1840? Or was it really in the wake of the Mexican War when you get this massive expansion into the great southwest and the Mexican Session which we'll take up actually next week?

还是1840年,在墨西哥战争的前夕,美国大举扩张进入,广阔的西南部地区及墨西哥会议的召开,这些其实我们下周都会讲到

耶鲁公开课 - 美国内战与重建课程节选

So the Joule free expansion involves opening this valve and asking what happens when this gas moves into the other bulb or distributes between the two.

焦耳自由膨胀就是,打开阀门后的过程,气体从一个腔跑到另一个腔,并在它们之间平均分配。

麻省理工公开课 - 热力学与动力学课程节选

And here, in an isothermal expansion, The bath is putting back the energy that the gas is expanding or using to expand, and so the energy is flowing back into the gas through the environment in the isothermal expansion.

而在等温膨胀中，恒温环境将气体膨胀对外做功,而损失的能量又返还回来，在等温膨胀中,能量从环境,流向系统。

麻省理工公开课 - 热力学与动力学课程节选