- #1
Getterdog
- 83
- 6
This is really basic,and I’m not seeing something obvious,but I’d appreciate help with this concept. In differential form dA= -tds-pdv. However s and v are the natural variables for this free energy and are held constant . As I understand it the Helmholtz free energy is the energy available to do work holding t and v constant. So according to the differential form ds and dv are 0 as these are held constant.,how can there be a change in the HFE during a process holding these constant.? Feeling really dumb.