And our heat of reaction or enthalpy of reaction is defined as the enthalpy at constant pressure.

我们的反应热，或反映,的焓被定义为恒压，等温。

麻省理工公开课 - 热力学与动力学课程节选

There's our condition for equilibrium at constant temperature and pressure.

这就是我们在,恒定温度和压强下的平衡条件。

麻省理工公开课 - 热力学与动力学课程节选

Well that process of control to maintain a constant environment inside our body, whether it's an environment of constant mass or constant composition, or constant temperature, is called homeostasis.

这个控制过程维持着,体内环境的恒定,不论是内环境中物质的量的稳定,或者成分的稳定,或温度的稳定,这种状态叫做内稳态

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What we need to do is get rid of the Coulomb tag that we have - that's how we measure our electron charges - charge, and so we use this epsilon nought quite often, this permativity constant of a vacuum to make that conversion.

怎么量度电子电荷,所以我们会经常用到,这个epsilon，nought记号,这是真空中的介电常数,我们还要指出,这个介电常数。

麻省理工公开课 - 化学原理课程节选

nRT So, dp/dT, for our ideal gas, at constant volume, remember pV is nRT.

对于理想气体状态方程pV等于，所以对理想气体。

麻省理工公开课 - 热力学与动力学课程节选

du/dV So now our du/dV, dp/dT at constant T is just T times dp/dT which is just p over T minus p, it's zero.

现在我们的恒定温度下的，等于T乘以dp/dT，在这里,等于p除以T，最后再减去p，结果是0。

麻省理工公开课 - 热力学与动力学课程节选