What is Condensation
The process of changing a gas (or vapour) to a liquid by cooling is called condensation where a gas is cooled enough (by lowering its temperature). There its particles lose so much kinetic energy that they slow down, move closer together until they start being attracted to each other and form a liquid. So, when steam (or water vapour) changes into water on cooling, it is called condensation of steam (or condensation of water vapour).It is the reverse of vaporization. (Boiling)
The Water Cycle
There is a constant exchange of water between the air, land and sea and between the living organisms and their environment. Thus, there are two overlapping water cycles; one which does not involve living organisms, and the second one is biological water cycle that involves living system.
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Global Water Cycle:
- Water evaporates from the hydrosphere [oceans, seas, rivers, streams, lakes, ponds, moist soil] with sun’s heat and forms clouds.
- The clouds are blown over the lands, where they are cooled enough to drop the water as rain, snow, hail and sleet.
- Rain may fall directly into the ocean also. Some water from rain and melting snow soaks into the ground, and some flows in rivers and returns directly to the seas.
The ground water comes to surface again by springs and pumps. It is used in agriculture, industry and homes. This water finally evaporates into the atmosphere. Water vapour added by evaporation to the atmosphere, again form clouds. This completes the global water cycle