Substance evaporation temperature

indianaronald

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?

mfb

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

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indianaronald	Substance evaporation temperature Tweet 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?

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