The average temperature on Mars is 80 degrees below zero, and can get a lot colder at times.
火星上的平均温度是零下80度,有时还会更冷。
Absolute zero (-460? F) is the total absence of heat; and all matter becomes inert and incapable of reacting at that temperature.
绝对零度(摄氏零下273度)时完全没有热能的存在。在这个温度时,所有物体分子都呈现静止状态,不会发生任何反应。
So du/dT isn't going to be zero in the high temperature limit, in this case. But it stops changing at some point.
所以du/dT在这样的高温极限下不会是零,但它在某一点就不再变化。
But we've defined the enthalpy of those elements in their stable state at room temperature and pressure as zero, right?
但我们已经定义了这些,元素处于它们室温和常压下,最稳定的状态时的焓为零,对吧?
What we define as zero is the enthalpy of every element in its natural state at room temperature and ambient pressure.
我们将零点定义为每种元素,在室温和正常大气压下,在其自然状态下的焓。
SdT This has minus T dS minus S dT, but the dT part is zero because we're at constant temperature.
这一项包含负的Tds和,但是dT的部分等于零,因为温度为常数。
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