What is the amount of heat required to change 1 lb of vapor into 1 lb of liquid at the same temperature known as?

The amount of heat required to change 1 lb of vapor into 1 lb of liquid at the same temperature is referred to as the Latent Heat of Condensation. This process occurs when a vapor cools down to the point where it transforms into a liquid, typically releasing a significant amount of heat in the process. This heat is not used to change the temperature but rather to change the state of the substance.

Understanding this concept is vital in air conditioning and refrigeration because it plays a crucial role in the cooling cycle. During the refrigeration cycle, refrigerants absorb heat as they evaporate and release latent heat when they condense back into a liquid. Recognizing this process helps in designing systems that efficiently manage heat transfer, ensuring optimal performance and energy use.

The other concepts mentioned, such as Latent Heat of Vaporization and Latent Heat of Fusion, refer to different phase changes—specifically the heat needed to vaporize a liquid into a gas and the heat needed to change a solid into a liquid, respectively. Evaporator Superheat involves the heating of a vapor past its saturation point and does not relate directly to the phase change of condensation.