This is true in gases and for particles dissolved in solutions - but diffusion does not occur in solids. Particles diffuse down a concentration gradient, from an area of high concentration to an area of low concentration. This is how the smell of cooking travels around the house from the kitchen, for example.
Diffusion experiment. Potassium permanganate is placed into a beaker of water. Molecular diffusion, often called simply diffusion, is the thermal motion of all liquid or gas particles at temperatures above absolute zero. The rate of this movement is a function of temperature, viscosity of the fluid and the size mass of the particles.
Diffusion explains the net flux of molecules from a region of higher concentration to one of lower concentration. However, diffusion can still occur in the absence of a concentration gradient. The result of diffusion is a gradual mixing of material.
In a phase with uniform temperature, absent external net forces acting on the particles, the diffusion process will eventually result in complete mixing. Privacy Policy. This is because substances move in and out of cells through diffusion. An example of diffusion is when you make a cup of coffee with hot water.
When coffee is put in water, the coffee molecules are highly concentrated. The molecules in the coffee start to spread in between the water molecules. Now through diffusion, the coffee molecules will be in a lower concentration compared to when the coffee was just put in the hot water.
Diffusion happens because gases and liquids move from place to place in quick random motions.
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