Precipitation occurs when a part of the atmosphere saturates itself with water vapour and when the right temperature comes its condenses and precipitates. The two processes which make the air saturated are the cooling of air molecules and the addition of water vapour.
When a solution containing a particular cation is combined with another solution containing a certain anion, the formation of an insoluble compound can often occur. A precipitate is considered the solid that divides.
What is Precipitation?
It is a chemical reaction in which you mix two solutions of two ionic substances and a solid ionic substance forms.
Example: When a silver nitrate solution is poured into a sodium chloride solution, producing a white silver chloride precipitate.