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Diffusion refers to the process by which molecules intermingle as a result of their kinetic energy of random motion. Consider two containers of gas A and B separated by a partition. The molecules of both gases are in constant motion and make numerous collisions with the partition.
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The spreading of the molecules of one substance from one place to another place is called diffusion. we can observe this when we lit a incense stick in a corner of the room and then the molecules of that incense stick move throughout the room and we can smell it.

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