how did the relation cv = cp- R arises
rahul , 9 Years ago
Grade 10
Thermal Physics> how did the relation cv = cp- R arises
3 Answers
grenade
Last Activity: 9 Years ago
well if you know that
change in enthalpy dH = change in internal energy dU + dnRdT
now open all the terms
ncpdt = ncvdt +nrdt
cancelling the underlined and bold letters
cv=cp-R
grenade
Last Activity: 9 Years ago
i will refer u that u should again read class 11 physics and chemistry thermodynamics for your further clarification
Abhishek Singh
Last Activity: 9 Years ago
It arises from the first law of the thermodynamics
dq = dU + pdv …..........(1)
for const pressure dq= n Cp dT
and dU= nCvdT
always holds true .
PV=nRT------> Pdv= nRdT at const pressure
Put all these in eqn. 1
n Cp dT = nCvdT + n RdT
----------> Cp - Cv = R
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