Which of the following is NOT a thermodynamic property of refrigerants?

Flammability is not considered a thermodynamic property of refrigerants. Thermodynamic properties are characteristics that describe the state of a substance and its behavior in thermodynamic processes. Examples of such properties include the critical point, saturation point, and enthalpy.

The critical point refers to the highest temperature and pressure at which a refrigerant can exist as a liquid and vapor in equilibrium. The saturation point indicates the specific temperature and pressure conditions under which a refrigerant changes phase from liquid to vapor (boiling) or vapor to liquid (condensation). Enthalpy is a measure of energy in a thermodynamic system and is important in calculating heat transfer during refrigerant changes in state.

In contrast, flammability pertains to the chemical properties of a substance, specifically its ability to ignite and burn when exposed to an ignition source. While understanding a refrigerant's flammability is essential for safety and handling, it does not fit into the category of thermodynamic properties that define the physical behavior of the refrigerant under different conditions.