What temperature does pure water melt at?

Pure water melts at 0°C, which is the temperature at which ice transitions to liquid water under standard atmospheric pressure. This phase change occurs because, at this temperature, the energy supplied to the ice allows the rigid structure of ice to break down, enabling the molecules to move freely and form liquid water.

The significance of this melting point is also reflected in practical applications, such as in meteorology and cooking. It is important to remember that the melting point can change under different pressure conditions, but under normal atmospheric pressure, 0°C is universally accepted as the melting point of pure water.