Diffusion

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The process of flowing of a substance from one place to another. is called diffusion.
When you burn a fire you will see smoke coming out of it. The smoke slowly passes itself to all directions. Does someone cause the smoke to flow to different directions? Ofcourse not. The smoke flows naturally on its own. This phenomenon is called diffusion.

Region of higher concentration: In the above example the place close to the fire has lot of smoke so it is called the region of higher concentration.

Region of lower concentration: The place farther away form the fire have less smoke or no smoke at all and is called region of lower concentration.


Definition

"The process of flow of a substances from the region of higher concentration to a region of lower concentration without any barrier for the flow is called diffusion".

Let's consider another example by doing this activity:

Take a glass and into it pour clean clear water. Cut small piece of blood red beet root. Leave the watered glass with the beet root   for sometime. You will observe that the red color from the piece of beet starts flowing (diffuses) to different directions. 

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