## q and w in a reversible process

$\Delta U=q+w$

Shrita Pendekanti 4B
Posts: 22
Joined: Fri Sep 25, 2015 3:00 am

### q and w in a reversible process

Does q necessarily equal -w in a reversible process?

Trixie Le 3K
Posts: 14
Joined: Thu Oct 08, 2015 3:00 am

### Re: q and w in a reversible process

No, not necessarily. q = -w when it is an isothermal reversible process because the change in internal energy of an isothermal reversible process is 0 and (change in internal energy) = q +w and if q + w =0 then therefore you can transform the equation into q=-w because the temperature and internal energy has no change, so if reversible expansion happens by work, then heat must be inputted into the system to be canceled out and have 0 change of internal energy.