enthalpy is defined as(adsbygoogle = window.adsbygoogle || []).push({});

h = u + pv

so, dh = du + d (pv)

if the process is constant pressure,

dh = du + p dv (change in internal energy + boundary work )

during constant pressure process, if heat is added to the system, it increases its internal energy as well as it does the expansion boundary work. so the net heat added will increase the enthalpy of the system.

if the process is constant volume,

dh = du + v dp (what is this extra term v dp??).

during constant volume process, heat added will just raise the internal energy. so what happens to enthalpy ?

**Physics Forums | Science Articles, Homework Help, Discussion**

Dismiss Notice

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Constant volume process

Loading...

**Physics Forums | Science Articles, Homework Help, Discussion**