First that salt kills microbes and talking in terms of diffusion in the surrounding environment, water diffuses between cells to maintain the same concentration of solutes (such as salt) on both sides of the cell.
Mass is transferred from one area of a system to another area through the process of diffusion as a result of a concentration gradient. The procedure results in a concentration equilibrium within the system. Areas of high concentration of salts and sugars in a solution will diffuse into the surrounding solution. The term for this is simple diffusion.
The definition of diffusion is the transfer of individual molecules of a substance from a region of higher concentration to a region of lower concentration through a semipermeable barrier.
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