They named their albums "Volume One" and "Volume Two" for the same reason.

VOA: special.2010.05.07

And then V minus the excluded volume term is equal to RT. Two parameters, this is the attraction between two atoms or molecules in the gas phase.

以及V减去一个排斥项,等于RT，两个参数，这是气体状态下两个原子,或者分子之间的吸引力。

麻省理工公开课 - 热力学与动力学课程节选

They recently released a second album called "Volume Two."

VOA: special.2010.05.07