Which process is involved in spreading the smell of the cooked food from the kitchen?
(a) When an incense stick (agarbatti ) is lighted in one corner of a room, its fragracne quickly spreads in the entire room. Name the process involved in this.
(b) A girl is cooking some food in the kitchen, The smell of food being cooked soon reaches her brother's room, Explain how the smell could have reached her brother's room.