Diffusion is the process wherein the molecules merge as a result of their kinetic energy of random motion. It occurs in liquids and gases because their molecules move randomly. The molecules move from a region of higher concentration to a region of lower concentration, down the concentration gradient, until the concentration equalizes throughout the medium. Since distribution occurs in a variety of conditions, diffusion can be classified into two major types: Simple diffusion and facilitated diffusion. However, there are more types of diffusion which are relevant in other disciplines of sciences such as atomic diffusion, Knudsen diffusion, kinesis and so on. In gases and fluids, particles move haphazardly here and there. The particles crash into one another or with their compartment. This makes them alter course. In the long run, the particles are spread through the entire compartment. Dispersion occurs all alone, without mixing, shaking or wafting. In living things, substances move all through cells by dissemination. For instance: Breath produces squander carbon dioxide, making the measure of carbon dioxide increment in the cell. In the long run, the carbon dioxide focus in the cell is higher than that in the encompassing blood. The carbon dioxide at that point diffuses out through the cell layer and into the blood. Water diffuses into plants through their root hair cells. The water moves from a zone of high fixation (in the dirt) to a territory of lower focus (in the root hair cell). This is on the grounds that root hair cells are mostly porous. The dispersion of water this way, is called assimilation.  

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