dT/dp is mu JT. So for a real gas like air, this is a positive number. It's not zero.

所以对于像空气这样的真实气体，这是一个正数，不等于零。

麻省理工公开课 - 热力学与动力学课程节选

And the temperature scale that turns out to be well-defined and ends up giving us the concept of an absolute zero is the ideal gas thermometer.

比如理想气体温标,它有精确的定义,并能引出绝对零度的概念,今天我们就先来谈谈它。

麻省理工公开课 - 热力学与动力学课程节选

B=0 There's going to be some temperature where B is equal to zero. In that case, your gas is going to look awfully like an ideal gas.

在某个温度,这时，实际气体的表现，十分接近理想气体,高于这一温度它是正的。

麻省理工公开课 - 热力学与动力学课程节选

This saving is more than paid for by the value of the saved generating capacity, so the net cost of saving the gas itself is less than zero.

FORBES: Magazine Article

The proposal lumps gas turbines and coal boilers into the same source category, and it holds coal power plants to a CO2 performance standard that nearly all natural gas combined cycle plants and exactly zero commercial coal power plants can meet.

FORBES: EPA Nominee Gina McCarthy Has A History Of Misleading Congress

"We're measuring the zero-to-60 speed but also the gas mileage, " says Lankford.

FORBES: Entrepreneurs