Difference between relative humidity and humidity
"Humidity" and "Relative Humidity" are not the same thing. Humidity means amount of water vapour present in air with respect to total amount of air. Relative Humidity is the amount of moisture in the air 'relative' to the temperature (i.e relative humidity is the amount of moisture in the air compared to what the air can "hold" at that temperature. When the air can't "hold" all the moisture, then it condenses as dew).