At what temperature does water boil in degrees Celsius?

Water boils at 100 degrees Celsius under standard atmospheric pressure, which is defined as 1 atmosphere (atm) or 101.3 kilopascals (kPa). The boiling point is the temperature at which the vapor pressure of the liquid equals the surrounding atmospheric pressure, allowing bubbles of vapor to form within the liquid. At higher altitudes, where the atmospheric pressure is lower, water can boil at temperatures below 100 degrees Celsius. Conversely, in a pressurized environment, such as in a pressure cooker, water can boil at temperatures exceeding 100 degrees Celsius.

Therefore, during normal conditions at sea level, the boiling point of water is consistently recognized as 100°C, making this the correct answer.