Ibliss: "...Well, this reminds me of heat and energy..."

Well, Ibliss, you might be laughing, but there is a "similar" distinction between energy and heat also (and work). Doing thermodynamics a la Karatheodory, energy is a quantity describing both states and processes, while heat and work only describe processes (i.e. changes of the state of the system). But then one can always claim context, and sometimes with good reasons.

How about those refs?