Question

A container with rigid walls is covered with perfectly insulating material. The container is divided into two parts by a partition. One part contains a gas while the other is fully evacuated (vacuum). The partition is suddenly removed. The gas rushes to fill the entire volume and comes to equilibrium after a little time. If the gas is not ideal,

Answer 1

ANSWER

Since the wall is expanding against the vaccum ΔW=0

Also, as it is insulated, ΔQ=0

Using first law of thermodynamics,

ΔQ=ΔU+ΔW

ΔU=0