Give reason for the following observation: The smell of lighted incense stick spreads several meters away.
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Solution
The smell of lighted incense stick spreads several meters because of Diffusion.
Diffusion is a process resulting from the random motion of molecules by which there is a net flow of matter from a region of high concentration to a region of low concentration.
A familiar example is the perfume of a flower that quickly permeates the still air of a room.