Water is the only naturally occurring substance on earth that exists in three physical states: solid, liquid, and gas
Water exists as ice in solid form, as water in liquid form, and as vapor in gaseous form.
Water is a universal solvent because it can dissolve most of the substances in it as compared to any other liquid.
The physical state of water can be both liquid or gas at 100°C is because 100°C is the boiling point of water as well as the condensation temperature of the steam.