Water boils at a temperature of 100°C (212°F) at standard atmospheric pressure. However, this temperature may vary depending on the air pressure and altitude. At higher altitudes, the boiling point of water decreases due to the decrease in air pressure. For instance, at the top of Mount Everest, where the air pressure is significantly lower, water boils at around 68°C (154°F). Similarly, in a pressure cooker, the boiling point of water may increase due to the increase in air pressure.