Temperature, Bubble Point: The temperature at which saturated liquid begins to evaporate at a constant pressure. Zeotropic refrigerant blends are characterized by having both bubble point and dew point temperatures. Single constituent refrigerants and azeotropic refrigerant blends, however, evaporate and condense at the same temperature at a constant pressure. For these refrigerants, bubble point and dew point temperatures are the same.

Temperature, Dew Point: The temperature at which saturated vapor begins to condense at a constant pressure. See Temperature, Bubble Point

Pressure, Bubble Point: The pressure at which saturated liquid begins to evaporate at a constant temperature. Zeotropic refrigerant blends are characterized by having both bubble point and dew point pressure. Single constituent refrigerants and azeotropic refrigerant blends, however, evaporate and condense at the same pressure at a constant temperature. For these refrigerants, bubble point and dew point pressures are the same.

Pressure, Dew Point: The pressure at which saturated vapor begins to condense at a constant temperature. See Pressure, Bubble Point

Density: The mass of the refrigerant divided by its occupied volume.

Enthalpy: The total energy content of the refrigerant.

Entropy: The energy content of the refrigerant that is unavailable for doing useful work.

Specific Heat, Isochoric: The amount of heat required to change refrigerant temperature by one degree per unit mass of refrigerant at constant volume.

Specific Heat, Isobaric: The amount of heat required to change refrigerant temperature by one degree per unit mass of refrigerant at constant pressure.

Velocity of Sound: The speed at which sound travels in the refrigerant.

Viscosity, Dynamic: The force required to overcome internal molecular friction and cause the refrigerant to flow at a certain rate.

Thermal Conductivity: A measure of the refrigerant's ability to conduct heat.