What is the boiling point of water at sea level?

The boiling point of water at sea level is 100°C. This temperature is significant because it is the standard boiling point where water transitions from a liquid to a gas at atmospheric pressure, which is typically defined at one atmosphere (101.3 kPa).

At this boiling point, the vapor pressure of water equals the atmospheric pressure surrounding it, allowing the molecules to escape from the liquid phase into steam. This property is essential not only in chemistry and physics but also has practical implications in cooking and various scientific applications.

Other temperatures listed, such as 90°C, 110°C, and 120°C, do not represent the boiling point of water at sea level. Water will not boil until it reaches 100°C at this pressure, which is why 100°C is universally recognized as the boiling point of water under standard conditions.