Net or overall movement of particles form a region of higher concentration to a region of lower concentration.
Due to particles having kinetic energy and is random and an unequal distribution will occur until an equlibrium is met.
Short diffusion distance is faster because there is less chance of collisions of particles.
The higher the temperature the higher the rate of difffusion - due to an increase in kinetic energy.
The greater the concentrration gradient the faster the rate of diffusion.
The larger the area of an exchange surface, the higher the rate of diffusion.
THe thinner the exhange surface, the higher the rate of diffusion.
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