Saturation depends on which two properties?

Saturation depends on which two properties?

• A. Temperature and Pressure
• B. Volume and Mass
• C. Time and Temperature
• D. Pressure and Humidity

Answer: (A)

Saturation for a pure substance occurs when liquid and vapor are in equilibrium. This equilibrium lies along the saturation curve on a pressure–temperature diagram, so knowing one of these two properties fixes the other on the curve. Therefore, temperature and pressure are the two properties that set saturation; raising temperature increases the saturation pressure, and at a fixed temperature the saturation pressure determines the saturation temperature. Volume and mass describe how much of each phase you have but do not determine the phase boundary. Time and humidity relate to dynamics or mixtures rather than the pure substance’s equilibrium boundary.

Saturation for a pure substance occurs when liquid and vapor are in equilibrium. This equilibrium lies along the saturation curve on a pressure–temperature diagram, so knowing one of these two properties fixes the other on the curve. Therefore, temperature and pressure are the two properties that set saturation; raising temperature increases the saturation pressure, and at a fixed temperature the saturation pressure determines the saturation temperature. Volume and mass describe how much of each phase you have but do not determine the phase boundary. Time and humidity relate to dynamics or mixtures rather than the pure substance’s equilibrium boundary.