- #1
wannabegenuin
- 1
- 0
Hello.
I'd like to ask a question about meaning of Gibbs free energy.
In undergraduate school, I learned that Gibbs free energy is "available" energy we can extract from system at constant pressure and temperature.
G=H-TS=U+PV-TS
In above expression, however, I can't understand why "TS term" is included.
I think "PV" energy term is necessary for making some space to put the system in the environment.
Fig. 5.1 in textbook (An introduction to thermal physics, V. Schroeder), the author explained as "Some energy, equal to TS, can flow in spontaneously as heat", "The more entropy the system has, the more energy the system can get into the heat".
I didn't understand this sentence at all.
My question is "when system has some entropy, why this receives the heat (=TS) from environment?"
Is there anyone who can explain this clearly?
I'd like to ask a question about meaning of Gibbs free energy.
In undergraduate school, I learned that Gibbs free energy is "available" energy we can extract from system at constant pressure and temperature.
G=H-TS=U+PV-TS
In above expression, however, I can't understand why "TS term" is included.
I think "PV" energy term is necessary for making some space to put the system in the environment.
Fig. 5.1 in textbook (An introduction to thermal physics, V. Schroeder), the author explained as "Some energy, equal to TS, can flow in spontaneously as heat", "The more entropy the system has, the more energy the system can get into the heat".
I didn't understand this sentence at all.
My question is "when system has some entropy, why this receives the heat (=TS) from environment?"
Is there anyone who can explain this clearly?