Relative Humidity 27 : The ratio of water vapor in the air to the maximum amount of vapor the air can hold at a given temperature and pressure. Fire behavior is dependent on, and can be predicted from, relative humidity
Sequoia and Kings Canyon National Parks, National Park Service, Glossary of Fire Terms, Three Rivers, California, USA 2004. http://npshistory.com/publications/nps-glossary.pd f, (For Fr - Amer) {462}