Question

What is the physical state of water at $0^0\mathrm{C}$.

Answer 1

• 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 vapour in gaseous form.
• The physical state of water can be both solid or liquid at 0°C because 0°C is the melting point of ice as well as the freezing point of water.
• The liquid form of water starts to become solid (ice) at this temperature.

Both water and ice exist in this phase of equilibrium at 0°C.