Water can change from one state to another. When water changes state, it requires either heat gain or heat loss

Freezing is the process in which water changes from the liquid state to the solid state. Melting is the process in which water changes from the solid state. Melting is the process in which water changes from the solid state to the liquid state

The freezing point is identical to the melting point. When water is losing heat at 0C, it freezes, When ice is gaining heat at 0C, it melts.

When water freezes, the temperature remains at 0C until all the water has been frozen. This is because the heat energy is used to melt the ice instead of raising the temperature

Freezing requires heat loss

Evaporation takes place at any temperature as long as water is in the liquid state

Steam is hot water vapour that has a temperature of 100C or more

Water boils at the boiling point, which is at 100C for pure water

Boiling is the process in which water changes from the liquid state to the gaseous state

When water boils, the temperature remains at 100C until all the water has been boiled off. The heat gained by water is used to boil the water instead of raising its temperature