Option b is correct. Gas in a cylinder expands against a piston from point a to point b on the p-v plot at the right. in this process the temperature decreases.
Think about a gas that is firmly sealed inside a vessel that has a moveable piston. By depressing the piston downward, we may manipulate the gas, and we can heat the gas by exposing the container to a flame or immersing it in a pot of boiling water. The pressure and volume of the gas can alter when we apply it to certain thermodynamic processes.
Using a PV diagram, also known as a pressure volume diagram, is an easy way to see these changes in the pressure and volume. On a PV diagram, each point represents a distinct gas condition. While the volume is indicated on the horizontal axis, the pressure is given on the vertical axis.
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