4 months, 3 weeks ago
It doesn't always. In space water boils instantly despite the incredibly cold temperatures. The boiling point of a liquid is determined by the amount of pressure pushing on it, and the the temperature it's at. Under normal conditions on Earth, water will boil at 100.0C because it's the temperature at which water molecules undergo a phase change from liquids to gasses at sea level (1 atm of pressure). The temperature overcomes the effects of air pressure (and some intermolecular forces between water molecules) and allows the liquid to vaporize into a gas. Interestingly the boiling point at higher altitudes is lower then at locations at sea level. E.g.: Water boils at 94.4C in Denvor Colorado with an elevation of 1609.3 meters above sea level.
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