The boiling point of water is the temperature at which the vapour pressure of the liquid water equals the surrounding pressure. Since we also know that pressure and temperature are directly proportional so water at high pressure will have high boiling point and at low pressure will have low boiling point. When we maintain vacuum pressure below atmospheric pressure the water begins to boil at temperature lower than degree Celsius. Here is table showing the variation of boiling point of water with pressure. Boiling Point is the temperature at which the pressure due to the vapor coming out of the liquids becomes equal to external pressure.
What happens to boiling point of water in vacuum? - Quora
The boiling point of a substance is the temperature at which the vapor pressure of a liquid equals the pressure surrounding the liquid   and the liquid changes into a vapor. The boiling point of a liquid varies depending upon the surrounding environmental pressure. A liquid in a partial vacuum has a lower boiling point than when that liquid is at atmospheric pressure. A liquid at high pressure has a higher boiling point than when that liquid is at atmospheric pressure. For a given pressure, different liquids will boil at different temperatures. The standard boiling point has been defined by IUPAC since as the temperature at which boiling occurs under a pressure of 1 bar.
Boiling Water for Drinking: What Temperature and How Long?
At standard pressure the pressure of the earth's atmosphere at sea level , water boils at degrees Celsius. At lower atmospheric pressure e. If under higher pressure e. The temperature of boiling water at sea level is The temperature of boiling water at sea level is Which is most likely be the temperature of boiling water?
John Walter is an emergency preparedness consultant with eight years of experience and training in related fields. He is a passionate prepper living in the Sacramento area of California. In a best-case scenario, your water source is never jeopardized, even after natural disasters. Of course, this is rarely the case.