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Why does water boil at 100 degree?

Updated: 4/28/2022
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Wiki User

14y ago

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Water only boils at 100o C at Standard Sea Level Atmospheric Pressure. If the Pressure increases the Boil Point rises. If the Pressure decreases the Boiling Point goes down.

The Centigrade Temperature Scale was DESIGNED so that 100o is the boiling point of water, and 0o is the Freezing Point of water. The Scale was then equally divided into 100 parts. So, it is a man-made definition that water boils at 100o C.

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10y ago
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14y ago

Water boils when the vapor pressure of the water is equal to the atmospheric pressure of the air around it, At the surface of the Earth the atmospheric pressure is 760 mm of Hg. At that pressure the vapor pressure of water at 100oC is also 760 mm Hg. High in the mountains the boiling point of water would be much lower. In industrial boilers where the pressure is several atmospheres the water would not boil until it reaches several hundred degrees.

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Q: Why does water boil at 100 degree?
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