Sorry, I should not have said heat input, I should have said energy input, energy is needed, this energy is converted to heat which in turn evaporates your water.
Leaving a glass sitting on your counter doesn't mean the world stops turning, there is air circulating (energy), there is light (energy), your house still warms and cools during the day (energy).....
Just like a microwave, you don't just put in something, press a button and voila - magically it's now warm - it must be magic, because the inside of the microwave is still cool, so we didn't add heat, and really it just sat there for 2 minutes and now it's hot, it must be magic.
The microwaves that are generated transfer energy to the particles that make up the food, the particles get excited by this energy and convert it to heat.
Here, this is from the US govenment....
Heat (energy) is necessary for evaporation to occur. Energy is used to break the bonds that hold water molecules together, which is why water easily evaporates at the boiling point (212° F, 100° C) but evaporates much more slowly at the freezing point. Net evaporation occurs when the rate of evaporation exceeds the rate of condensation. A state of saturation exists when these two process rates are equal, at which point the relative humidity of the air is 100 percent. Condensation, the opposite of evaporation, occurs when saturated air is cooled below the dew point (the temperature to which air must be cooled at a constant pressure for it to become fully saturated with water), such as on the outside of a glass of ice water. In fact, the process of evaporation removes heat from the environment, which is why water evaporating from your skin cools you.
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