Re: More BTU's was: Re: [pct-l] Insulation above, insulation below

[ROYROBIN@aol.com]

In a message dated 11/16/1999 3:23:54 PM PST, Richard Calliger writes:

<< I could be wrong- however I believe the reason your bag frosts up is due to
 the condensation (dew point) not the amount of heat escaping the bag! Pretty 
 sure anytime I sleep out *and* there is frost on the bag, there is usually 
frost
 on the ground/leaves/pine needles/etc. as well.  >>

Right.  Condensation, and also your breath, wet clothes and whatever, 
contribute to the moisture which appears on the outer surface of the bag.  
Whether it freezes, sublimates, evaporates or just stays wet depends on a lot 
of things (such as the air temperature, amount of wind, humidity, etc.)  One 
of the factors is the rate of radiative heat loss.  That one factor can be 
reduced by getting under the trees or other shelter.  
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