3 posts • Page 1 of 1
When calculating the change in entropy, do you always have to analyze the heat flow to determine if it is positive or negative? So, if the surroundings gain heat while the system loses it, would deltaS of the system be negative and deltaS of the surroundings be positive?
I feel like there are a lot of ways to evaluate the change of signs for entropy--heat conventions is one of them, but because there are so many derivations of heat, you could also look at entropy change through different variables (this is good because then if you're not given heat or do not know how heat flows, you can evaluate things like the temperature, phase, etc.) However, because Delta S = - (Delta G - Delta H)/T and Delta S= Delta q/T and Delta S=Kbln (V2/V1), we need to understand that increasing one variable does not necessarily mean we can always tell the sign of entropy. The good part is we won't probably have too complicated systems, but for the most part, yes, entropy change can be viewed as in many lenses such as heat transfer.
Who is online
Users browsing this forum: No registered users and 1 guest