[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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