The water boils at 100 degrees Celsius at 1 atmospheric pressure. We all know that the simple way to answer this question is 100 degrees Celsius. But we need to understand that the boiling point of any substance depends on the vapour pressure of the liquid which is equal to the pressure of the gas above it. The boiling point of water, therefore, depends on the following parameter:
- Altitude: As the altitude increases, the boiling temperature decreases and vice versa happens when the altitude decreases.
- The purity of water: If we consider sea water, the salt content is more making the sea water less pure and therefore the temperature at which sea water boils would be high when compared with the fresh water.