At sea level, with normal atmospheric pressure, water boils at 100 degrees Celsius (212 degrees Fahrenheit). Water changes from a liquid to a gaseous state at this temperature, creating steam or water vapour. It is important to keep in mind, nevertheless, that the boiling point of water might fluctuate somewhat with air pressure. For instance, the boiling point of water drops at greater elevations when the air pressure is lower. Contrarily, the boiling point of water can rise to 100 degrees Celsius under greater pressures, such as those found in pressure cookers.