Particles move about randomly, and after a bit they end up evenly spaced.
Diffusion is the gradual movement of particles from places where there are lots of them to a place where there are fewer of them.
It is just the natural tendency for stuff to spread out.
The fancy way of saying all of this is:
Diffusion is the spreading out of particles from an area of high concentration to an area of low concentration.
Diffusion happens in both solutions and gases, this is because the particle in the substances are free to move about randomly.
The simplest type is when different gases diffuse through each other, an example of this is when the smell of perfume diffuses through the air in the room.
The bigger the difference in concentration, the faster the rate of diffusion.
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