hair dryer

Normally, I don't use the hair dryer since I find it to be a waste of time to do stand around blowing hot air on my hair when it can be done naturally as I am typing this post for example. Obviously, I sometimes need to dry my hair more quickly and it comes to my rescue. But have you ever wondered why blowing hot air makes your hair dry faster?
I'm no expert, but here's my idea. So process of drying is synonymous to evaporating the moisture - basically the water on the hair. So the question can be reformulated as why does blowing hot air make water evaporate more quickly? Still there are two parts to this question - one is blowing HOT air and the other is just the act of blowing something. We may know from experience that just the act of blowing air accelerates the evaporation process. The other part of the question then is what does heat do?
So let's think about the process. When the water evaporates, water molecules first convert from the liquid state to the gas state and move from the "hair environment" to the near by air. Now, the near by air has more water molecules than before and it's "not as easy" for other water molecules move to the air state. Conceptually, this is very similar to getting salt out of the cucumber for pickling. Higher the outer salt content (ie. lower water content), the faster the rate of cucumber  dehydration. As time passes, the difference in water content is reduced. Blowing air is like changing the salt water the cucumber is in contact with. The humid air is replaced with dry air.
So let's tackle the second problem - what does heat do? I think there are two way to think about the effect that heat can have. Perhaps most obviously, heat supplies the energy required for the transition from liquid to gas. When you heat water sufficiently, water boils. This is because the liquid --> gas transition is happening very rapidly.  The other way to think about it is to consider the moisture holding capacity of hot vs cold air. Hot air can retain more water and so it's "easier for water to go into air". These are two sides of the same coin... for reasons I don't want to elaborate here (but to give you a hint, think about why hot air can retain more water)
It's important to re-evaluate the effect of the blowing air now. The air flow "refreshes" both moisture level and the heat level.
This is my theory as to how it works - I'm personally convinced this is the case... but I'm no authority... I guess this is a disclaimer.
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Me?...