At sea level, the boiling point of water is 100 degrees Celsius (212 degrees Fahrenheit). This is the temperature at which water changes from a liquid to a gas, a process known as boiling. Boiling occurs when the vapor pressure of the water equals the atmospheric pressure surrounding it. At sea level, atmospheric pressure is approximately 1 atmosphere (atm), which allows water to boil at 100°C.

However, as altitude increases-such as when you are in the mountains—the atmospheric pressure decreases. This means water molecules need less energy to escape into the air, and therefore, the boiling point of water drops. For example, in a place like Denver, Colorado (approximately 1,600 meters or 5,280 feet above sea level), water boils at around 95°C (203°F). At the summit of Mount Everest, water can boil at just 70°C (158°F).

This lower boiling point at high altitudes affects cooking. Foods boiled in water may take longer to cook because the temperature isn’t as high as it would be at sea level. For this reason, pressure cookers are often used at high elevations-they increase the pressure inside the pot, which raises the boiling point of water and allows food to cook faster and more effectively.

In summary, the boiling point of water is not a fixed value but is dependent on the surrounding atmospheric pressure. At higher altitudes, where pressure is lower, water boils at a lower temperature. Understanding this principle helps us adapt cooking methods and even plays a role in scientific experiments or industrial processes.