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What is the boiling point of water in space? Replies: The boiling point of water is fixed by its temperature, and the vapor pressure of water at that temperature. So for example, if the water is at 100 C. the boiling point is 100 C. at a pressure of 1 atm (which is equal to 760 mm of Hg).
Boiling occurs when the vapor pressure reaches or exceeds the surrounding pressure from the atmosphere or whatever else is in contact with the liquid. At standard atmospheric pressure (1 atmosphere = 0.101325 MPa), water boils at approximately 100 degrees Celsius. That is simply another way of saying that the vapor pressure of water at that temperature is 1 atmosphere. At higher pressures (such as the pressure generated in a pressure cooker), the temperature must be higher before the vapor pressure reaches the surrounding pressure, so water under pressure boils at a higher temperature.