In the atmosphere, liquid water collects around minute particles called condensation nuclei.
As per the known fact, the water is evaporated from water reservoirs on Earth, like ocean, sea etc. This evaporated water condenses in nuclei, thus increasing its density. Consequently high density particles of water fall on Earth due to force of gravity. This process of falling of condensed water particles is termed as rainfall or precipitation.
Now, after evaporation the condensation begins. To start this process condensation nuclei is required. Condensation nuclei or cloud seeds are very minute sized particles present on cloud. They are hygroscopic in nature thus attracting water and starting the condensation process. Condensation nuclei are produced from different components of atmosphere like pollen, smoke, dust, salt from ocean etc.
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