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Untill a balance between the liquid - let's say water - and the substance surrounding it - let's say the air - is reached. The factors influencing evaporation - when the molecules of water leave the liquid and 'fly' with the molecules of air - are the relative air humidity, pressure, temperature, (air and water movement, and so on).

Water will evaporate until air humidityl allow it - that is until a moment when a full saturation of the air with the molecules of water is reached - at a given temperature and pressure!

Water evaporates very slowly at room temperature, but being heated the process is intensified.

Again, even at the room temperature water will evaporate when put in a vacuum - until the empty space will be filled with the molecules of water .

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