The boiling point of a substance is the temperature at which it changes state from liquid to gas. The boiling point of water is 100°C (212°F).The boiling point of water is 100°C (212°F) at normal atmospheric pressure. Boiling point can vary depending on the pressure of the surrounding environment. For example, at higher altitudes, atmospheric pressure is lower and the boiling point of water is lower.
Changing forms of water include solid, liquid, and gas. Temperature affects the form of water because water will freeze at 0°C (32°F) and boil at 100°C (212°F). When the temperature of water is below 0°C it will become a solid, when the temperature is between 0°C and 100°C it will be in a liquid state, and when the temperature is above 100°C it will become a gas.