Three primary measurements of humidity are widely employed: absolute, relative, and specific. Absolute humidity is expressed as either mass of water vapor per volume of moist air (in grams per cubic meter) or as mass of water vapor per mass of dry air (usually in grams per kilogram).Perry, R.H. and Green, D.W, (2007) Perry's Chemical Engineers' Handbook (8th Edition), Section 12, Psychrometry, Evaporative Cooling and Solids Drying McGraw-Hill, Relative humidity, often expressed as a percentage, indicates a present state of absolute humidity relative to a maximum humidity given the same temperature. Specific humidity is the ratio of water vapor mass to total moist air parcel mass.
Three primary measurements of humidity are widely employed absolute relative and specific Absolute humidity is expressed as either mass of water vapor per volume of moist air (in grams per cubic meter) or as mass of water vapor per mass of dry air (usually in grams per kilogram)Perry RH and Green DW (2007) Perry's Chemical Engineers' Handbook (8th Edition) Section 12 Psychrometry Evaporative Cooling and Solids Drying McGraw-Hill Relative humidity often expressed as a percentage indicates a present state of absolute humidity relative to a maximum humidity given the same temperature Specific humidity is the ratio of water vapor mass to total moist air parcel mass