Vapor pressure

{
  "id": "MLC-T-ENV-029502",
  "term": "Vapor pressure",
  "field": "Environment",
  "definition": "1. The force per unit area exerted by a vapor in an equilibrium state with its pure solid, liquid, or solution at a given temperature. Vapor pressure is a measure of a substance's propensity to evaporate. Vapor pressure increases exponentially with an increase in temperature.\n\n2. The partial pressure exerted by the vapor (gas) of a liquid or solid substance under equilibrium conditions. A relative measure of chemical volatility, vapor pressure is used to calculate air-water partition coefficients (i.e., Henry's Law constants) and volatilization rate constants.\n\n3. A measure of a substance's propensity to evaporate, vapor pressure is the force per unit area exerted by vapor in an equilibrium state with surroundings at a given pressure. It increases exponentially with an increase in temperature. A relative measure of chemical volatility, vapor pressure is used to calculate water partition coefficients and volatilization rate constants.\n\n4. A measure of a substance’s volatility, or its propensity to partition to the vapor (gaseous) phase from its condensed phase (i.e., solid or liquid).",
  "abbreviation": "VP",
  "subject": "Land, waste and cleanup",
  "references": [
    "Underground Storage Tank Sites Guide Glossary; Glossary: Study of the Potential Impacts of Hydraulic Fracturing on Drinking Water Resources; Glossary of Technical Terms: Office of Underground Storage Tanks",
    "Leaking Underground Storage Tanks Sites Glossary",
    "Terms of Environment",
    "EPA ExpoBox Terminology"
  ],
  "url": "https://mlchart.com/terminology/environment/vapor-pressure/"
}