Diffusion

Introduction: Diffusion can be defined as the movement of particles from a region of high concentration to a region of low concentration across a concentration gradient. So therefore diffusion is the process in which a gas or a substance that is in a liquid expands to fill all the volume equally. Cause of movement: The reason by which the expansion of the gas or the substance in the liquid is due to the motion of its particles. The particles of a substance dissolved in a solvent whether they are molecules or even just an atom are in a continuous random movement. A given particle in the dissolved substance is equally likely to move out of the area or also into the area in which there is a high concentration of the particle present. Due to the higher number of particles in the area of the high concentration, the total number of particles moving towards the lower concentration is greater than the total number of particles moving towards the area with the higher concentration. This is called a 'net flux' of solute particles from areas of high to areas of low concentration.



Diffusion in physics 'Ficks Law' in physics is used in physics to describe diffusion and is used to find the diffusion coefficient. This law also suggests that a particle will move from an area of high concentration to an area of low concentration across a concentration gradient.



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