What will happen to the humidity without air?



How humid shall we feel if there’s no air around us? Humidity is the amount of moisture which the air holds, so hot air is more humid and cold air is less humid. Am I correct? Turns out to be No. The fact is humidity is not actually the amount of water suspended in the air like aerosols, instead it is the amount of water being converted into vapour. Technically water itself has nothing to do with humidity, the air above in the middle of an ocean can be pretty dry (less humid). It’s the water vapour or gas that makes the air so heavy. Now, the air itself is not a carrier for the vapour, it has no such carrying power, I mean water vapour is independent of the presence of air. The air is just there, not playing any role in humidity getting all the blame for nothing. The term that hot air can hold more water vapour is also something misleading. As I already said air cannot ‘hold’ water vapour because if we observe in a molecular level, air and vapour are both gases and in gases molecules are far too apart from each other to exert any force on themselves. It is the water which has a greater tendency to convert into vapour while the temperature is higher than normal. So if we replace air totally with some other gas or combination of gases or something like that, the humidity would not bother to mind at all.

All these stuffs give rise to another question in my brain, where does the vapour come from, is it from somewhere where water is boiling at 100 degrees from the heat of sun? I will definitely come to it later.
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