When we light a fire, smoke rises from it and gradually disappears where does the smoke go ? To understand this phenomenon , you must realize that smoke is made up of tiny particles of ash and tiny drops of water. Ash is the non-burnable material found in a tree’s cells, while water is found in any type of wood. The hot air rising from the fire carries these minute particles upwards, in the form of smoke.
As the smoke rises , the drops of water evaporate , to become water vapour. The ash particles spread out, and gradually mix with the air above, to become a part of dust seen in the atmosphere. This is why smoke from a fire disappears after a while, and does not remain as smoke.