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Vapor pressure is defined as the pressure exerted by a vapor in equilibrium with its condensed phases (solid or liquid) at a given temperature in a closed system. The equilibrium vapor pressure is an indication of a liquid’s evaporation rate. The pressure exhibited by vapor present above a liquid surface is known as vapor pressure. As the temperature of a liquid increases, the number of molecules transitioning into a vapor also increases, thereby increasing the vapor pressure.

Did you know?

  • In general, vapor pressures of liquids at ambient temperatures increase with decreasing boiling points.
  • The higher the temperature, the higher the vapor pressure.
  • The higher the vapor pressure, the faster a liquid evaporates in ambient air.
  • The faster the rate of evaporation, the more vapor in the air.
  • A substance with a high vapor pressure at normal temperatures is often referred to as volatile.
  • The vapor pressure for a given chemical or product is typically found on a Safety Data Sheet (SDS) in the Physical and Chemical Properties section.