DIFFERENT STATES OF WATER
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In nature, water exists in three states.
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It could be in the form of:
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Liquid (e.g., rain, river, sea),
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Solid (e.g., ice, snow, hail),
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Gas (e.g., water vapour)
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Water can be heated to convert it into vapour.
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If we leave water in an uncovered vessel on a summer afternoon outside our house, after a few hours, the level of water in the vessel decreases.
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This is because a lot of it would have escaped into the atmosphere in the form of water vapour.
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In reverse process, the conversion of the vapour of a substance to its liquid form is called condensation.
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Water vapour is also added into the air by the leaves of plants, through the process of transpiration.
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Evaporation and condensation of water takes place on a very large scale on the surface of Earth and its atmosphere.
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These processes play a key role in cloud formation and rain.
