Boiling Point of Water

Calculates the boiling temperature of water at a specified altitude under normal weather conditions. The lower the air pressure, the lower the boiling point, so the sooner the water starts to boil. At sea level it is at the well-known 100°C (degrees Celsius), on Mount Everest it is only around 70°C. The boiling point drops by about 0.003354°C (or Kelvin) per meter above sea level, so about one degree every 300 meters.
Enter one value, the other will be calculated.

The boiling point is the temperature at which water begins to boil; it depends on the surrounding pressure. This pressure, the air pressure, tends to decrease with the height above sea level. Of course, the pressure can also change at the same height depending on the weather, so the boiling point calculated here applies to normal conditions. In low-pressure areas the boiling point drops slightly, in high-pressure areas it rises slightly.
The water used here is normal drinking water. If something has been added to it, the boiling point can also change; for example, the temperature is higher in salt water. Saturated salt water, for example, has a boiling point of 108 degrees at sea level. Sugar also increases the boiling point, even more than salt.
For those interested in further information: the assumption used here that the boiling point decreases linearly with air pressure is incorrect in itself, but for the areas in which we are on earth it provides fairly good results with little deviation from the actual value. An exact calculation, however, would be very complex; one would not have to calculate with the altitude, but with the current air pressure and with the boiling point curve, which sags slightly compared to the straight line and can be represented by a combination of exponential equations, the Magnus formula.

Physics commonly uses SI units. Here is a calculator to convert lengths, temperature, pressure, speed and other units.