Relative Humidity 15 : The amount of water in a volume of air divided by the amount of water that volume of air could hold in a vapor state at a given temperature. It is expressed as a percentage from 0 to 100
The Flood Control District of Maricopa County, Glossary of Flooding Terms, AZ, USA 2009. http://www.fcd.maricopa.gov/Education/glossary.asp x, (ND/ Flood - Amer) {477}