This quantity is exactly zero for an ideal gas and we'll discover why eventually it has to do with what we mean by an ideal gas it turns out.

对理想气体它是零,这点我们接下来会知道是,为什么，这与为什么我们叫它理想气体有关。

麻省理工公开课 - 热力学与动力学课程节选

It turns out that this quantity here, which is called eta of J the Joule free expansion parameter, is not quite zero.

这个量后来被，称作焦耳膨胀系数,其实并不等于零。

麻省理工公开课 - 热力学与动力学课程节选

And, if this quantity is less than zero, the bonding is favorable.

如果这个数小于，能够形成键。

麻省理工公开课 - 固态化学导论课程节选

First off, it assumes zero change in the quantity of goods.

FORBES: The Real Impact of Quantitative Easing (Next to Nothing!)

As the whole point of Quantitative Easing and the government stimulus was to raise output and employment (because, for those who have not noticed, we have almost 14 million citizens looking for work), there is no reason to maintain the assumption of zero change in the quantity of goods.

FORBES: The Real Impact of Quantitative Easing (Next to Nothing!)

Eventually, it has to change because inventory is a countable quantity and hence bound above zero.

FORBES: A Few Housing Notes