What is water?

Facts about water for students

What is water?

Water is one of our most important natural resources and essential for the survival of all living things.

Water is a made up of tiny units called molecules which are made of even tinier units called atoms. A molecule of water is made of three atoms - two hydrogen atoms and one oxygen atom. The chemical formula for water is H20.

Water can be found in three physical states on earth: liquid, solid (ice) and gas (water vapour).

Heat causes water to change from one state to another. The freezing point of water is 0˚C and the boiling point is 100˚C.

One litre of water in liquid form weighs about 1kg.

Source: Encyclopedia Britannica