The density of solids under zero temperature and zero pressure is an important physical parameter.

固体在零温零压下的密度是一个重要的物态参数。

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In the heat-supply system with distributed variable frequency pump, there exists a zero pressure difference, at which supply and return water pressures are equal.

分布式变频泵供热系统中存在零压差点，该点供回水压力相等。

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The other is a mechanical automatic reversing mechanism designed for atmospheric pumps, which adopts involute (zero pressure Angle) CAM mechanism as reversing mechanism.

另一种是为气压泵设计的机动自动换向机构，该机构是利用渐开线(零度压力角)凸轮机构作为换向机构。

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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？

麻省理工公开课 - 热力学与动力学课程节选

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。

麻省理工公开课 - 热力学与动力学课程节选

This is just an equality. I have a constant pressure dH process. This term here is equal to zero.

这是一个等式，这是个恒压过程,这项等于零，这意味着。

麻省理工公开课 - 热力学与动力学课程节选

But Princeton Lyman, of the Council on Foreign Relations, says the net effect of all this pressure has been zero.

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Once deforestation falls to zero, which seems a plausible goal for 2030, the pressure for other forms of reduction will become even greater, and inaction now will make those reductions harder to achieve.

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