[lit-ideas] Re: Climate -- another stupid question

  • From: John McCreery <mccreery@xxxxxxx>
  • To: lit-ideas@xxxxxxxxxxxxx
  • Date: Mon, 6 Sep 2004 15:53:41 +0900

On 2004/09/06, at 13:48, Mike Geary wrote:

> Humidity depends upon the temperature of the air and the moisture 
> available
> to saturate the air.  The number of grains of water vapor varys with
> temperature.  Each degree of temperature rise will support an ever 
> greater
> number of grains of moisture.  At any specific temperature air will 
> support
> a specific number of grains of moisture, beyond that point the moisture
> condenses out.  The measure of grains of water vapor in the air is the
> humidity of the air.  Relative humidity  is the measure of humidity 
> relative
> to the amount of humidity the air could hold at that temperature.  If 
> there
> is plenty of moisture being supplied to a mass of hot air it could 
> reach
> 100%, in which case it would be raining.    Comfort depends  on the 
> relative
> humidity-- if the air mass around Memphis is say 97 degrees and a 
> steady
> supply of moisture is being pumped up from the Gulf of Mexico to mix 
> with
> that air mass then the relative humidity could easily be 95% which it 
> often
> is in Memphis in summer.  This air would feel wetter than  97 degrees 
> at
> Myrtle Beach with 85% relative humidity (if, say, the wind is blowing 
> from
> inland) because the rate of sweat evaporation would be appreciably 
> less in
> the 95% relative humidity of Memphis and one's skin would tend to 
> become wet
> with perspiration.

Count on the air-conditioning expert.

One contributing factor may be the direction of prevailing winds, 
carrying moist air toward the land or dry air toward the sea.

John McCreery

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