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Where does the energy come from to lift water by osmosis? (feddit.uk)

submitted 2 weeks ago* (last edited 2 weeks ago) by [email protected] to c/[email protected]

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For example in a tree, the water is lifted from the high concentration in the soil to the low concentration higher up in the tree. But at the end of that process the water has been elevated, which should take energy (=mgh), but it seems like it kind of gets lifted for free without spending any energy?

Similarly, dipping a paper towel into a bowl of water, the water "climbs" the towel (by capillary action?) and absorbs upwards, meaning the water was lifted upwards (so gained potential energy) seemingly for free?

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[–] [email protected] 5 points 2 weeks ago

I don't know, but given that forces involved are on the molecular level, I suspect those are driven by the kinetic energy of particles in a fluid (i.e. heat) and that there's a very slight cooling going on.