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[[File:Dominica boiling lake.jpg|thumb|A boiling lake in [[Dominica]]]]
The '''boiling point''' of a [[substance]] is the [[temperature]] at which the substance boils, or enters a state of rapid [[evaporation]]. For pure [[water]] this is 100° [[Celsius]] or 212° [[Fahrenheit]]. This is measured at one [[Atmosphere (unit)|atmosphere]], that is, the air pressure at [[sea level]].
Boiling points can be changed in several ways. The addition of [[solute]]s or other substances usually changes the boiling point. Changing the [[pressure]] on a liquid changes its boiling point.
The boiling point of a liquid depends on the [[pressure]] of the surrounding air. An increase in air pressure increases the boiling point; a decrease decreases the boiling point. In the low pressure environment at the top of Mt Everest for example, water boils at only 69 °C. (156.2 °F).
It can also be defined in terms of [[vapour pressure]] as the temperature at which vapour pressure of liquid becomes equal to atmospheric pressure
If you add [[sugar]], [[salt]] or any other [[impurities]] to the water, it will usually make the boiling point higher. An exception is [[alcohol]], which will have a lower boiling point.
{{physics-stub}}
[[Category:Thermodynamics]]
[[Category:Basic physics ideas]]
The '''boiling point''' of a [[substance]] is the [[temperature]] at which the substance boils, or enters a state of rapid [[evaporation]]. For pure [[water]] this is 100° [[Celsius]] or 212° [[Fahrenheit]]. This is measured at one [[Atmosphere (unit)|atmosphere]], that is, the air pressure at [[sea level]].
Boiling points can be changed in several ways. The addition of [[solute]]s or other substances usually changes the boiling point. Changing the [[pressure]] on a liquid changes its boiling point.
The boiling point of a liquid depends on the [[pressure]] of the surrounding air. An increase in air pressure increases the boiling point; a decrease decreases the boiling point. In the low pressure environment at the top of Mt Everest for example, water boils at only 69 °C. (156.2 °F).
It can also be defined in terms of [[vapour pressure]] as the temperature at which vapour pressure of liquid becomes equal to atmospheric pressure
If you add [[sugar]], [[salt]] or any other [[impurities]] to the water, it will usually make the boiling point higher. An exception is [[alcohol]], which will have a lower boiling point.
{{physics-stub}}
[[Category:Thermodynamics]]
[[Category:Basic physics ideas]]