0 degrees Celsius is the freezing point of water. This means that at 0 degrees Celsius, water can exist as both a liquid and a solid (ice).

* If the temperature is exactly 0 degrees Celsius, the water will be in a state of equilibrium where both liquid and solid phases coexist.

* If the temperature is slightly above 0 degrees Celsius, the water will be liquid.

* If the temperature is slightly below 0 degrees Celsius, the water will be solid (ice).