Question about relative humidity: Why is it not always 100%?

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1 total messages Started by Dale Worley Sun, 30 Aug 1987 15:20

#482

Author: Dale Worley
Date: Sun, 30 Aug 1987 15:20

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young@hoqax.UUCP (HUH) writes:
> My question is, why is the relative humidity not always 100%?
> 
> Shouldn't the liquid water on the surface of the earth (which there seems to be
> a plenty of) evaporate into the atmosphere and eventually reach an equilibrium,
> thereby making the actual pressure of water vapor equal to the vapor pressure of
> water?

You are completely correct, except for the fact that the Earth's
atmosphere is not in equilibrium.  It is a monstrous heat engine
driven by solar radiation.  If the Sun went out, not only would the
R.H. go to 100%, but all the winds would stop, etc.

Dale
-- 
Dale Worley    Cullinet Software      ARPA: cullvax!drw@eddie.mit.edu
UUCP: ...!seismo!harvard!mit-eddie!cullvax!drw
Apollo was the doorway to the stars - next time we should open it.
Disclaimer: Don't sue me, sue my company - they have more money.

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