Re: water evaporating

Jerry (walfishj@erols.com)
Tue, 31 Dec 1996 16:13:25 -0500 (EST)

Moshe Farsi asked:
>Is it true that wind causes water to vaporize faster?

The answer is basic physics. A stream of air reduces the air pressure at
perpendicualr to this. This principal is part of the siphoon effect.

Therefore when wind blows it reduces the air pressure above the surface. If
the surface is water than the reduction of air pressure lowers the
temperature at which the water can evaporate. It also reduces the number of
extra calories needed to enable the transfer of state from liquid to gas.

Think of a modern hair dryer. The wind pushed by a propeller casuses air to
flow over the hair creating a vacuum. You need the wind; otherwise you
would only need heat. The extra heat used for the super dry function
provides the extra calories needed for the state transfer.