In psychrometrics, what does the term "RH" stand for?

The term "RH" in psychrometrics stands for Relative Humidity. Relative humidity is a key metric that describes the amount of moisture in the air relative to the maximum amount of moisture that air can hold at a given temperature. It is expressed as a percentage, with 100% indicating that the air is fully saturated with water vapor and cannot hold any more moisture, while 0% would indicate entirely dry air.

Understanding relative humidity is essential in fields such as chemical engineering, HVAC design, and meteorology, as it affects comfort levels, material properties, and chemical processes that are sensitive to moisture content. The concept is crucial for analyzing psychrometric charts and understanding the behavior of air and water vapor mixtures in various engineering applications.