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 The boiling point of water is 100°C

Liquid states of water:
 On cooling the water vapour, it gradually changes back to liquid water.
 The process by which a gas changes to its liquid form on cooling is known as
condensation. And, on heating the ice, it changes to liquid water.
 The process by which a solid changes to its liquid form on heating is known
as melting.

Distribution of Earth’s Water
• 2/3 part of our planet is covered with water.
• About 97% of the water on the Earth is salty and only 3% is fresh water.
• All of these fresh water is not available for human use, as over two-third of
fresh water is frozen and is present in the form of ice at glaciers and polar ice
caps.
• The remaining fresh water is present as groundwater.