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Osmosis - a special case of diffusion The particles or molecules in liquids and gases are in constant random motion, allowing them to spread around and fill their environment. They will move from an area where they are highly concentrated to an area where they are less concentrated and this will continue until they are evenly distributed. This process is called diffusion. (Mitford, H. - Class Notes 07/10/02) The cells of all living things are separated from each other by a membrane and rely upon diffusion as a means of transporting some substances in and out of the cell across the membrane. (Griffin, N.C., A Soaked Potato) For example, when humans breathe, oxygen molecules enter the lungs and these molecules diffuse across the lung membrane into the blood stream. Diffusion occurs because the oxygen molecules are in a high concentration in the lung and are in a lower concentration in the blood stream....

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