Diffusion? What powers diffusion? it seems to be hugely important for bodily functions as well as atomically and possibly astronomically
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Imaging a crowed of people in an otherwise empty field. Everybody has a sudden urge to go jogging. What you will likely see is that the people will not stick to the crowd but spread out to the whole field due to two factors: A) People would keep walking forward which eventually leads out of the crowd. B) People running towards a group are more likely to turn to avoid collision, them does running in the opposite direction.
With molecules this is the same. They move due to termal energy and push away from each other due to electromagnetic forces.
This process is known as diffusion.
Mathmatically this process means that structure gets lost (from the fairly localised crowd on the field to a constant level of people everywhere) which can be described by an increase in entropy.
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