Question about the equation for expressing the entropy of a system.

[Kzin]

Here is a quick one - how do you express as an equation (in standard format) the value X, which is the entropy difference between the sum of the set of components in a system and the total entropy of the system. I'm a bit rusty on this stuff. Thanks!

[krtxmrtz]

Maybe try to post this in a physics forum. For ecample,
http://www.physicsforums.com/forumdisplay.php?f=61

[mendhak]

It's not

S2-S1 = DELTA Q/T

?

Or am I confusing it with something else?