If 20 lb of saturated refrigerant is present, how does its pressure compare to 5 lb of saturated refrigerant at the same temperature?

The scenario describes the properties of saturated refrigerants, which follow specific principles dictated by thermodynamics. Saturated refrigerants exist in a state where both liquid and vapor phases coexist at a given temperature. In this state, the pressure of a saturated refrigerant is solely dependent on its temperature rather than its mass.

At a constant temperature, regardless of whether there are 20 lb or 5 lb of saturated refrigerant present, the pressure remains the same. This principle applies because pressure in a saturated system is related to temperature and the characteristics of the refrigerant, not the quantity of the substance. Therefore, the saturation pressure is a unique value at a particular temperature for that refrigerant.

This concept is crucial for understanding thermodynamic properties in refrigeration systems, ensuring reliable operation and safety in applications. Thus, both 20 lb and 5 lb of saturated refrigerant at the same temperature demonstrate the same pressure.