Today, as I was putting perfume on, I noticed that the pleasant smell of it filled the room rather quickly after I opened the bottle. This is due to diffusion. The perfume molecules have a very high concentration inside the bottle, but once I opened it, the molecules started to spread in every direction in the room, going to places where they are present in less concentration. This is how particles move during diffusion: from a place with higher concentration to one with lower concentration.
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