the mass of water vapour present in the air expressed as a percentage of the mass that would be present in an equal volume of saturated air at the same temperature
Compare absolute humidity
relative humidity in American English
the amount of moisture in the air as compared with the maximum amount that the air could contain at the same temperature, expressed as a percentage
see also absolute humidity
Examples of 'relative humidity' in a sentence
relative humidity
Now it wasn't even dawn yet, and the relative humidity had to be way over seventy.