Wikipedia says about melting point that:
The melting point of ice at 1 atmosphere of pressure is very close to 0 °C (32 °F; 273 K); this is also known as the ice point.
But why it is very close and not exactly 0 °C.
Isn't 0 °C on Celsius scale defined as melting point of water.
I referred to various sources but can't find the answer. Only clue that I got is that it has something to do with triple point of water but still can't find the full explanation.
