|Jan15-11, 06:34 PM||#1|
Perceptive Temperature Difference Between 0 ft and 9,000 ft
If the temperature at both 9,000 ft and 0 ft (sea level) is 32 F, how much warmer would it feel at 9,000 ft due to the reduced thermal capacity of the air caused by lower air pressures?
Air has 28.5% less pressure at 9,000 ft compared with sea level (0 ft). 10.5 psi vs 14.7 psi respectively.
At sea level, a person who has a core temperature of 98.6 F who is standing in 32 F dry air would experience a relative temperature difference of 66.6 F. If this same person stood in 32 F dry air at 9,000 ft would he or she only experience a temperature difference of 47.5 F because of the reduced thermal capacity of the air?
0 ft = 98.6 F - 32 F = 66.6 F temperature difference
9,000ft = 66.6 F temperature difference * 71.45% air pressure difference = 47.5 F perceptive temperature difference
If the above calculations are correct, would a person standing in 32 F dry air at 9,000 ft feel as if he or she is standing in 51 F dry air at sea level (98.6 F - 47.5 F) due to the reduced thermal capacity of the air?
Thank you very much,
|Jan16-11, 03:19 PM||#2|
Well, if you're heating a building it definitely matters a lot, by the proportion you derived. For yourself, it would matter a little less because radiation and evaporation both play a pretty significant role in your heat loss.
|air, altitude, pressure, temperature|
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