Question

When an incense still ( agarbatti ) is lighted in one corner of a room, it's fragrance spreads in the whole room quickly.

Answer 1

Particles of matter are continously moving.. So when the temperature increases the kinetic energy of the particle also increase.

Thus we conclude that when we light a incense stick the temperature increase so the smell of incense stick spreads all over the room

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Answer 2

As because it has some gaseous thing like oxygen is there everywhere.
It spreads in whole room because it has some gaseous molecules in it