What is % RH?
Relative humidity, often referred to as RH, is the measure by which moisture in air is measured. It is represented by a percentage value between 0 and 100%, where the meaning of 100% RH is that the air cannot hold any more water at that temperature. A value of 25%RH would be typical of that found in a desert. Generally the ‘ideal’ value for enclosed living spaces is accepted to be 50% although in reality humidity variance between 40 and 60%RH is perfectly acceptable.
