Biology formulas

Diffusion

Diffusion is the spreading out of particles from an area of high concentration to an area of low concentration
It's the gradual movement of particles from places where there's lots of them to places where there's fewer
Spreading out
Happens in both solutions and gases becasue the particles move about randomly
The simplest is when gaes diffuses through each other, e.g perfume
Dissolved substances can move in and out of cells by diffusion
The cell membrane lets them in and out and still holds the cell together
Only very small molecules dissolve through the membranes
Big molecules like starch and proteins can't fit through the membrane
The particles flow through the cell membrane to an area where there's less of them
They move randomly and so go both ways but if there are a lot more on one side of the membrane there's an overall movement from that side

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