What is the specific volume of vapor at -20 degrees?

The specific volume of vapor represents the volume occupied by a unit mass of vapor at a given temperature and pressure. In the context of refrigeration, this value is crucial for understanding the behavior of refrigerants in their vapor state.

At -20 degrees, the specific volume is influenced by the properties of the refrigerant being examined as well as the corresponding pressure. The correct answer of 14.7187 indicates that at this specific temperature, the vapor occupies 14.7187 cubic units per unit mass. This is significant for calculating the efficiency of refrigeration cycles and for determining the appropriate sizing of components such as compressors and evaporators.

Given the specific characteristics of common refrigerants, the other values listed do not match the expected volume based on the pressure-temperature relationship for vapors at -20 degrees. Hence, the value of 14.7187 is the most accurate data point available for this scenario, reflecting the physical properties consistent with the conditions described.