The factors which influence diffusion are :

```
(a) Density: Rate of diffusion of a substance is inversely
proportional to square root of its relative density.
(b) Permeability of medium : Rate of diffusion
decreases with density of the medium.
```

© Temperature : A rise in temperature increases the

rate of diffusion.

(d) Diffusion pressure gradient : Rate of diffusion is

directly proportional to the difference of diffusion

pressure at the two ends of a system and inversely proportional to the distance between the two