QS Study

The potential ability of a substance to move from a region of high concentration to a region of low concentration at a constant, temperature end atmospheric pressure is called diffusion pressure. The diffusion pressure of gas is a gas balloon is higher than the diffusion pressure of its surrounding air. So when the balloon bursts, the gas inside the balloon spread throughout the surrounding air due to its higher diffusion pressure.

Factors Affecting Diffusion: Diffusion of a substance depends on temperature, atmospheric pressure. Concentration of molecules of that substance and concentration of the medium.

Temperature: with the increase of temperature diffusion usually increases.

Concentration of the substrate: The rate of diffusion will be higher if the concentration of molecules of the substrate is higher; if the concentration is less, rate of diffusion will be less.

Concentration of the medium: If the concentration of the medium, like water or air, is more, the rate of diffusion will be less; and if the concentration is less the rate of diffusion will be high.

Atmospheric pressure: Increase of atmospheric pressure will reduce the rate of diffusion and decrease of atmospheric pressure will increase the rate. Usually temperature and pressure at a certain place remain same at a certain time, in that case the concentration of the substance and the concentration of the medium become the factors to control diffusion. If the medium and the diffusion substance are same (as in the balloon and the surrounding air) then diffusion will continue till the concentration of the two become same.

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