Does particle size bring any difference to the rate of diffusion? Show an activity

Asked by prakamya | 10th May, 2010, 07:36: PM

Expert Answer:

Dear student,

diffusion is  a very slow process (on a macroscopic scale). There several physical factors that affect the rate at which particles diffuse. Organisms have been able to utilize some of these factors to regulate the transport of items.

  Size of the particle (molecular weight):  the source of energy for the movement of particles in diffusion is the heat in the environment. At a given temperature, a smaller particle (molecule) moves faster than a larger one. This is analogous to a person pushing an object. A person can push a wheelbarrow much faster than he/she can push a minivan. This is due to the size of the object being pushed. With the same amount of force, a smaller object can be pushed faster than a larger object. Thus the rate of diffusion is inversely proportional to the size of the particle. That is, a smaller particle will diffuse faster than a larger one.

Hope thi helps.

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Answered by  | 12th May, 2010, 02:08: PM

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