Final answer:
The subject of this question is Physics, specifically the behavior of a cylinder with a movable piston containing an ideal gas. The question asks about different scenarios such as isothermal compression, adiabatic expansion, constant volume, and constant pressure.
Step-by-step explanation:
The subject of this question is Physics. The question is asking about the behavior of a cylinder with a movable piston that contains a sample of ideal gas. The options provided describe different scenarios, such as isothermal compression, adiabatic expansion, constant volume, and constant pressure. Each option represents a different characteristic of how the gas behaves in the cylinder.