semi-technical question v. physiology

Discussion in 'Fitness & Nutrition' started by ccrooks, Mar 14, 2007.

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  1. ccrooks

    ccrooks New Member

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    i know that (one of) the main functions of sweat is to cool the body off, right? if that's the case, then how come it doesn't evaporate faster?

    we have this coolant in lab (Galden HT-55, if anyone's ever heard of it) that looks like water, but is like 5x as heavy. it has almost no surface tension and evaporates pretty much immediately. i spilled some on my hand the other day and it was FREEZING... and then by the time i looked down at my hand, it had already evaporated

    dumb question, i know, i was just thinking about it while running today
     
  2. turbage

    turbage New Member

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    Its purpose isn't to evaporate quickly, its to allow heat from the body to transfer out into the sweat.

    Due to the high specific heat of water (and the fact that often times its cooler than 37 C), it takes a lot of heat to warm up the sweat. Lots of heat leaving a system = lots of cooling within the system.

    I'm pretty sure thats how it works.
     
  3. watagatapitusberry

    watagatapitusberry OT Supporter

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    do you know the structural formula of HT-55? im willing to bet it has very little surface tension because there's no hydrogen bonding, which is one of the reasons it evaporates fast. Hbonding in water onther other hand, is a key feature in it's slow evaporation times
     
  4. Uglybob69

    Uglybob69 I miss beer.

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    I guess it was evolutionary easier for our body to just secrete something on to our skin that is very common in the body, rather than having to synthesise some other substance (probably very calorie intensive) that would evaporate faster.

    Just my uninformed theory. :rofl:
     
  5. jokka

    jokka OT Supporter

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    i'd rather sweat than stick my tongue out while i lift and have saliva dripping while panting like a retarded pooch. :hsugh:
     
  6. ccrooks

    ccrooks New Member

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    cool

    i think of weird stuff in between sets
     
  7. ccrooks

    ccrooks New Member

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    nah, no idea what the structure of HT-55 is :hs: sorry



    i guess it makes sweat more efficient in cooling if it doesn't evaporate fast. if it did, your skin would probably get cold while your body stayed hot
    not very efficient
     
  8. Layne Staley

    Layne Staley New Member

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    We cracked open one of the huge oxygen cylinders at work and would pour cups full of liquid oxygen and pour it on stuff. It was the same.....freezing cold and would evaporate on contact.
     
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