What does relative humidity (RH) express?

Relative humidity (RH) expresses the amount of water vapor present in the air in relation to the total amount of water vapor that the air can hold at a specific temperature. It is a percentage that indicates how close the air is to being saturated with moisture. This concept is essential in various fields, including construction, HVAC, and drying, as it directly affects processes such as moisture removal and material drying.

This understanding of RH helps professionals assess drying conditions and make informed decisions about equipment operation and environmental control. High RH indicates a greater concentration of water vapor in the air, while low RH signifies that the air can absorb more moisture, impacting the efficiency of drying efforts.