# Really quick question about entropy

1. Nov 10, 2007

### proton

My question may be kind of a dumb question, but I tried searching for the explanation online and in my crappy textbook and my lecture notes are kinda unclear.

Consider 2 systems, A and B, that are brought into contact with each other, with accessible states W_A and W_B, respectively. After contact, the combined system then has (W_A)(W_B). Now, is this true for equilibrium and/or nonequilibrium?

My guess is that its at nonequilibrium because the net entropy must remain the same or increase, which leads to the 2nd law of thermodynamics

2. Nov 13, 2007

### aman malik

you actually may try the zeorth law of themodynamics whichstates that if a system a is i themal equilibrium with a system b and system b is in thermal equi. with system c then and c are also in thermal equi.
i may have ans. your ques. wrong as it is unclesr to me

3. Nov 13, 2007

### electrous

present quesstion in clear way

in above sentences :rofl:your confused me atAfter contact, the combined system then has (W_A)(W_B). in physics you must represent question in clear way to proper understading OK

4. Nov 13, 2007

### proton

Ok, after systems A and B are brought into contact, the total number of microstates in the combined system consisting of systems A and B, is equal to (W_A)*(W_B)