How does the altitude on boiling water occur?

Boiling water occurs when the vapor pressure of the water equals the atmospheric pressure surrounding it. At higher altitudes, the atmospheric pressure is lower, which means water can reach its boiling point at a lower temperature. Consequently, water will boil at temperatures below the standard 100 degrees Celsius (212 degrees Fahrenheit) found at sea level, affecting cooking times and methods. This phenomenon explains why adjustments are often needed for recipes when cooking at high elevations.