1) Human Anatomy & Physiology Short Notes For B. Pharm (PART 1)
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2) Short Notes in Anatomy & Physiology For B.Sc. Nursing (PART 1)
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3) Short Notes in Anatomy & Physiology for GNM (PART-1)
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4) Short Notes in Anatomy & Physiology for GNM (PART-2)
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Diffusion is the movement of a component through space under the influence of a physical stimulus. The most common cause of diffusion is a concentration gradient, which tends to adjust the component concentration until it reaches equilibrium. In short, diffusion is the physical flow of material.
There are four related concepts used in the diffusion theory. One, velocities are needed to describe the movements for the total phase and the individual component. Two, the concentration, molar density, or mole fraction is used to define the number of molecules of interest within a defined volume. Third, the concentration gradient will show the shifts in concentration as time increases. Forth, the molar flux of a component is proportional to the concentration gradient and the diffusivity of that component.
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