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helmholtz free energy

so for helmholtz free energy a system is at constant volume and temperature.
Maximum work is =A2-A1 =free energy at state 2 - state 1
where A=U-TS
Can you use this relation even if T is not constant?
why does derivation make T constant?
Reply 1
Avatar for alow
alow
19
Original post by jonnypdot
so for helmholtz free energy a system is at constant volume and temperature.
Maximum work is =A2-A1 =free energy at state 2 - state 1
where A=U-TS
Can you use this relation even if T is not constant?

No.

why does derivation make T constant?


Try to go through the derivation with T not constant.
Reply 2
Avatar for jonnypdot
jonnypdot
OP
15
Original post by alow
No.


Try to go through the derivation with T not constant.


Right
how can i find the free energy from 2 states in which temperature, pressure change?
Reply 3
Avatar for jonnypdot
jonnypdot
OP
15
Anyone?

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