Humidity How is relative humidity measured? Prentice Hall - Science Explorer. Asked by BookRagsHelper 13 years ago 12/31/2012 3:21 AM Last updated by anonymous 13 years ago 1/2/2013 8:31 PM
Relative humidity is the ratio of the pressure fo water vapor in the air-water mixture to the saturated vapor pressure of water at a predetermined temperature. In other words, how much moisture is in the air.