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(B) In an adiabatic process,the system is thermally insulated from its surroundings,meaning $Q = 0$.According to the first law of thermodynamics,$\Del

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adiabatic expansion

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(B) In an adiabatic process,the system is thermally insulated from its surroundings,meaning $Q = 0$.According to the first law of thermodynamics,$\Delta U = Q - W$.Since $Q = 0$,we have $\Delta U = -W$.In an expansion process,the gas does work on the surroundings,so $W > 0$.Therefore,$\Delta U = -W Since the internal energy of an ideal gas is directly proportional to its temperature $(U \propto T)$,a decrease in internal energy results in a decrease in the temperature of the system.

The temperature of the system decreases in the process of

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