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