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-   -   Origin of IR radiation in living things ? (http://www.physicsforums.com/showthread.php?t=655410)

Steve314 Nov28-12 09:49 AM

Origin of IR radiation in living things ?
 
Hi,

I've been reading that in a relatively normal environment about 1/2 of human heat loss is due to radiation. Most of this seems to have a wavelength of 10-12 μm.

Could someone here speak to the molecular origin of this? I'm guessing it is mostly from water molecules going from a higher to lower energy state, but can't find any information on the specifics.

thanks in advance,

mfb Nov28-12 11:01 AM

Re: Origin of IR radiation in living things ?
 
Some transitions in molecules are involved, but don't forget blackbody radiation - the emitted photons have an energy which corresponds to typical kinetic energies of the moving molecules.


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