AP Physics 2
9.2 The Ideal Gas Law
9.1 Kinetic Theory of Temperature and Pressure
A cylinder fitted with a movable piston contains a substance existing in liquid-vapor equilibrium at a constant temperature \(T_0\). The piston is slowly pushed inward, reducing the volume of the cylinder by half while the system remains in thermal contact with a heat reservoir at temperature \(T_0\). Both liquid and vapor phases remain present throughout the entire process. Which of the following statements correctly describes the pressure of the vapor during this compression, and provides the correct physical reasoning?
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