I wish to understand evaporative cooling. Apparently the principle consists in pumping the vapour above a bath, hence extracting it's most energetic corpuscles and achieving cooling.(adsbygoogle = window.adsbygoogle || []).push({});

The aim is to derive the cooling power. My textbook states:

[tex]\frac{dQ}{dt} = L\frac{dn}{dt} \propto p [/tex]

L being the latent heat per mol and p the gas pressure. I don't see why the proportionality holds. Sorry if I miss something simple, I'm battling a light cold ;-)

[From here on one can use the gas pressure formula

[tex] p = p_0 \exp(-\frac{L}{RT})[/tex]

to demonstrate, how with linearly decreasing temperature the cooling rate decreases exponentially]

Thanks in advance for any help!

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# Evaporative cooling power

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