The boiling point of water is the temperature at which it changes from a liquid to a gas (vapor) at a given pressure. At sea level, the boiling point of water is 212 degrees Fahrenheit (100 degrees Celsius). However, the boiling point of water can vary depending on the pressure and altitude. For example, at higher altitudes, the atmospheric pressure is lower, so the boiling point of water is also lower. This is why water boils at a lower temperature in mountainous areas than it does at sea level.