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(A) From the ideal gas equation,$PV = nRT$,we have $T = \frac{PV}{nR}$.$1$. In the process $A \rightarrow B$,pressure $P$ is constant and volume $V$ i

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Increase as it goes from $A$ to $B$

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(A) From the ideal gas equation,$PV = nRT$,we have $T = \frac{PV}{nR}$.$1$. In the process $A \rightarrow B$,pressure $P$ is constant and volume $V$ increases. Since $T \propto V$ at constant pressure,the temperature increases.$2$. In the process $B \rightarrow C$,volume $V$ is constant and pressure $P$ decreases. Since $T \propto P$ at constant volume,the temperature decreases.$3$. In the process $C \rightarrow D$,pressure $P$ is constant and volume $V$ decreases. Since $T \propto V$ at constant pressure,the temperature decreases.$4$. In the process $D \rightarrow A$,volume $V$ is constant and pressure $P$ increases. Since $T \propto P$ at constant volume,the temperature increases.Comparing the options,the temperature increases as the gas goes from $A$ to $B$.

The pressure and volume of a gas are changed as shown in the $P-V$ diagram in this figure. The temperature of the gas will ........

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