Surface Area to Volume Ratio Small particles expose a large surface area to volume ratio to their surrounding compared to large particles. This makes molecules to move more slowly and closer to each other. As temperature increases the kinetic energy of the molecules increase making them to move faster and further from each other while drop in temperature decreases kinetic energy of molecules. Factors Affecting the rate of Diffusion Temperature Increase in temperature increases the rate of movement of molecules hence increases the rate of diffusion while decrease in temperature decreases the rate of movement of molecules. Rate of diffusion in liquids is slower than in gases. ILLUSTRATION OF DIFFUSION Potassium permanganate crystals dissolve in water and spread evenly until the whole water environment is coloured purple. Diffusion Diffusion occurs in gases, liquids, and solids as demonstrated in the following activities.
In this lesson we will discuss the first three of these processes: diffusion, osmosis and active transport. The processes through which this exchange occurs include diffusion, osmosis, active transport, phagocytosis and pinocytosis. The products of cellular activities which cells release to their environment include secretions and waste products. Materials taken in include water, oxygen, food substances, vitamins and minerals. Cell physiology refers to to the cellular activities including the movement of materials into and out of the cell across the cell membrane. Some of the manufactured materials pass out of the cell to be used for various activities. Molecules needed for cellular activities move into the cell across the cell membrane.
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