Equilibrium moisture content

n. Moisture content that a dead fuel particle  will attain if exposed for an infinite period in an environment of specified constant temperature and [relative] humidity (SAF 1990).


  • Discussion


When a fuel particle reaches equilibrium moisture content, net exchange of moisture between the particle and its environment is zero (SAF 1990). Equilibrium moisture content is a theoretical end-point rarely achieved in reality because temperature and relative humidity are not constant.


  • Units


    Fuel moisture content is most commonly expressed as the mass of water as a fraction or percentage of oven-dry mass. The term moisture fraction is sometimes used when moisture content is expressed as a fraction. Multiply moisture fraction by 100 to get moisture content as a percentage.


  • See Also

  • References

    • Society of American Foresters. 1990. Glossary of fire management terms used in the United States. McPherson, Guy R.; Wade, Dale D.; Phillips, Clinton B., compilers. SAF 90-05. Washington D.C.: Society of American Foresters. 138 p.


  • Notes

    • Author 

      Joe Scott, Research Forester

      Systems for Environmental Management