How can water evaporate from a pool in the summer when it is supposed to evaporate at 100°C ?
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Water can be dissolved in the air, just like salt can be dissolved in water. The melting point of salt is 800°C, but there’s still salt in the liquid ocean. Humidity is just the measure of how much of the air’s capacity to hold water is filled. Heating up or stirring air will speed up the process of water drying up, just like heating up water will speed up the dissolving of salt. It’s simply water molecules from the surface of the water sticking to the air molecules by random chance and getting dislodged from the rest of the water and being suspended in the air. When you cool down the solution, whether it’s air or water, the process of the solute coming out of solution is called precipitation. With salt, you can even form crystals this way, and if you get the air cold enough, you can form crystals of water too called snow.
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