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Substance evaporation temperature

  1. Jan 20, 2013 #1
    Can a substance only evaporate at the T(sat) at that particular pressure and why not even at a higher temperature?
    Example of a refrigerant at room temperature, pressurized container. But when it's opened, the P falls and T(sat) falls, so it goes to that T(sat) temperature to evaporate. But why? Why not evaporate at the room temperature itself?
  2. jcsd
  3. Jan 20, 2013 #2


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    Staff: Mentor

    Evaporation reduces the temperature of the surface until you have an equilibrium (or something close to it) at the surface.
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