principes_un_deux.py

Created by alten01

Created on May 05, 2025

663 Bytes

1er
deltaU = Q + W
du = dQ + dW
sys isole : deltaU = 0
Q et W ne sont pas des fct detat
elles dependent du chemin suivi

2eme
pour une transfo quelconque
deltaS = Sechange + Screation
pour une transfo reversible
deltaS = integrale de A à B de
dQ/T + 0
pour une transfo irreversible
deltaS = integrale de A à B de
dQrev/T + Screation 

deltaS = 0 transfo adia rev
deltaS > 0 transfo adia irrev

Sechange signe quelconque
Screation rev = 0
Screation irrev > 0



deltaS=int i f dQrev/T
isobare :
=int Ti Tf nCpdT/T
=n Cp ln(Tf/Ti)
isochore :
=int Ti Tf nCvdT/T
=n Cv ln(Tf/Ti)
adia rev :
= 0
adia irrev
> 0  

oublies par la reversibilite

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