Question

Where does energy in osmosis come from?

Answer 1

This includes movement in the form of osmosis and diffusion. Kinetic energy comes from all sorts of places, as all energy is really the same. It can come from sound waves, heat, friction and pressure, or even the kinetic energy of other molecules moving around and bumping into each other.

Answer 2

Osmosis happens due to statistics: molecules move randomly; so this movement causes more molecules, statistically, to move from a region of higher concentration (hence higher density of such molecules) to a region of lower concentration, where there are not as much molecules to move in the opposite direction. Therefore, the tendency of molecules to escape a region increases with its concentration in that region.

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