First slide

Thermodynamic processes

Question

When a gas expands adiabatically

Moderate

A

No energy is required for expansion
B

Energy is required and it comes from the wall of the container of the gas
C

Internal energy of the gas is used in doing work
D

Law of conservation of energy does not hold

Solution

$ΔQ = ΔU + ΔW = 0 \Rightarrow ΔW = - ΔU$
if $ΔW$ is positive i.e., gas does work then $ΔU$ should be negative meaning internal energy is used in doing work.

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