diffusion and osmosis

Diffusion refers to the process by which molecules intermingle as a result of their kineticenergy of random motion. Consider two containers of gas A and B separated by a partition. The molecules of both gases are in constant motion and make numerous collisions with the partition. If the partition is removed as in the lower

illustration, the gases will mix because of the random velocity of their molecules. In time a uniform mixture of A and B molecules will be produced in the container.

The tendency toward diffusion is very strong even at room temperature because of the high molecular velocities associated with the thermalenergy of the particle