First slide

First law of thermodynamics

Question

If Pis the pressure, U the internal energy and dV the volume increase of a system, then by definition:

Easy

A

dU=dQ+PdV
B

dU=dQ+ VdP
C

dU = dQ - V dP
D

dU = dQ - P dV

Solution

dQ = dU + p dv
du = dQ - P dv

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