Question

In the figure below, two systems $A$ and $B$ are separated by an insulating fixed wall (adiabatic wall) and also insulated from surroundings by insulated wall.

Choose the correct option regarding above information.

• A. The pressures of $A$ and $B$ will change with time.
• B. The temperatures of $A$ and $B$ will change with time.
• C. The thermodynamic states of $A$ and $B$ will not change with time.
• D. None of the above

Answer 1

Answer: (C)

Adiabatic or insulating walls do not allow flow of energy (heat) from one system to another, so no heat exchanges between systems $A$ and $B$.
Thus, the thermodynamic states (pressure and temperature) of $A$ and $B$ will not change with time. It means both the systems will be in thermal equilibrium separately.