First slide

First law of thermodynamics

Question

In a given process on an ideal gas, dW = 0 and dQ < 0. Then for the gas

Easy

A

the temperature will decrease
B

the volume will increase
C

the pressure will remain constant
D

the temperature will increase

Solution

According to first law of thermodynamics
dQ=dU+dW=dU+PdV as dQ is negative and dW=0
so dU is negative so temperature decreases.

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