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Dehydration

  • 17 Replies
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Offline Flash

  • Mountain Lion
  • *
  • 2013
Re: Dehydration
« Reply #15 on: August 09, 2019, 07:21:15 PM »
...
https://www.outsideonline.com/2106426/your-body-extreme-heat

This doesn't seem right:
Quote
But, if the air is warmer than your core temperature, sweat will not evaporate and instead drip off your skin or absorb into your shirt.

Isn't it a function of how dry the air is rather than how warm?

I took that and other statements to mean that it is difficult for the body to stay cool enough to avoid danger when the temperature outside is above body core temperature. From a strictly heat conduction standpoint you are in trouble unless some other mechanism can adequately affect surface cooling, i.e. evaporation.

Re: Dehydration
« Reply #16 on: August 11, 2019, 04:10:34 PM »
...
https://www.outsideonline.com/2106426/your-body-extreme-heat

This doesn't seem right:
Quote
But, if the air is warmer than your core temperature, sweat will not evaporate and instead drip off your skin or absorb into your shirt.

Isn't it a function of how dry the air is rather than how warm?

I took that and other statements to mean that it is difficult for the body to stay cool enough to avoid danger when the temperature outside is above body core temperature. From a strictly heat conduction standpoint you are in trouble unless some other mechanism can adequately affect surface cooling, i.e. evaporation.

Yeah...I think the author (or the editor) was confused on some of the science. Sweat certainly evaporates at temps over 99 degrees.

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Offline badknees

  • Actually, I was there once
  • Mountain Lion
  • *
  • 4391
  • I think I know that place
    • Through the Mirror
Re: Dehydration
« Reply #17 on: August 11, 2019, 06:18:12 PM »
There are many factors.

All else equal, the higher the ambient temperature the higher the evaporation rate.

However..
Temperature,
Relative humidity
Barometric pressure
Mixing ( think wind)
Surface area

All are factors in the evap rate
Not all those who wander are lost.
J.R.R. Tolkien

Through the Mirror
http://mirrormagic.com

 


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