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Relatii utilizate in rezolvarea problemelor in termodinamica
Numar de atomi in molecula |
Cv |
Cp=Cv +R |
1 |
2/3R |
5/2R |
2 |
5/2R |
7/2R |
3 sau mai multi |
6/2R =3R |
8/2R =4R |
1. Transformarea izocora V=const. , nui=const p/T=const-lege
a) L=0
b) Qv=niu*Cv*(T2 -T1)
DU=Qv-L
c) DU=Qv =niu*Cv DT
2. Transformarea izobara p=const niu=const V/T=const -lege
a) L=pDV=p(Vf-Vi)
b) Qp=niuCp*DT
DU=Qp-L=niuCp*DT-p*DV
DU=niuCpDT-niuRDT
DU=niuDT Cp-R)[Cv]
c) DU=niuCv*DT
3. Transformarea izoterma T-const niu-const p/V=const
a) DU=0
b) Q=L=niuRT*lnVf/Vi=niuRT ln pi/pf
Ecuatia de stare
pV niuRT
pVi niuRT1 | =>p(Vf-Vi)=niuR(T2-T1)
pVf niuRT2 | pDV=niuRDT
Relatia lui Mayer: Cp-Cv=R
Principuil I :DU=Q-L
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