## Thermodynamics 1st 2nd 3rd Law

isochoric/isometric: $\Delta V = 0$
isothermal: $\Delta T = 0$
isobaric: $\Delta P = 0$

Grace Han 2K
Posts: 33
Joined: Tue Nov 15, 2016 3:00 am

### Thermodynamics 1st 2nd 3rd Law

Can someone explain what the 1st, 2nd, and 3rd law of thermodynamics mean (how they differ)?

Justin Lau 1D
Posts: 51
Joined: Sat Jul 22, 2017 3:00 am

### Re: Thermodynamics 1st 2nd 3rd Law

The first law just says that the internal energy of an isolated system doesn't change i.e. energy is conserved. The second law states that the entropy increases in an isolated system for any spontaneous process. Finally, the third law says that as the temperature approaches 0 Kelvins, the entropy of a system also approaches a constant value.

torieoishi1A
Posts: 32
Joined: Sat Jul 22, 2017 3:00 am

### Re: Thermodynamics 1st 2nd 3rd Law

1ST: Law of Conservation of Energy-energy can't be created nor destroyed; it can only be transferred from one form to another. Equation: deltaU=q+w
2ND: Entropy of any isolated system always increases, going to maximum entropy.
3RD: Entropy of a system approaches a constant value as temperature approaches 0K.