Changes

Boiling points can be changed in several ways. The addition of [[solute]]s or other substances usually changes the boiling point. Additionally, changing the [[pressure]] on a liquid changes its boiling point.  

Boiling points can be changed in several ways. The addition of [[solute]]s or other substances usually changes the boiling point. Additionally, 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 raises the boiling point; a decrease in air pressure lowers the boiling point.<ref>{{Cite book|title=Chemistry: The Physical Setting|last=Kavanah|first=Patrick|publisher=Pearson|year=2018|isbn=978-0-328-98858-7|language=English}}</ref> In the low pressure environment at the top of Mt Everest for example, water boils at only 69 °C (156.2 °F). [[Aquanaut]]s find that water in their habitat only boils at high pressure.

The boiling point of a liquid depends on the [[pressure]] of the surrounding air. An increase in air pressure raises the boiling point; a decrease in air pressure lowers the boiling point.<ref>{{Cite book|title=Chemistry: The Physical Setting|url=https://archive.org/details/prenticehallbrie0000unse|last=Kavanah|first=Patrick|publisher=Pearson|year=2018|isbn=978-0-328-98858-7|language=English}}</ref> In the low pressure environment at the top of Mt Everest for example, water boils at only 69 °C (156.2 °F). [[Aquanaut]]s find that water in their habitat only boils at high pressure.

Boiling point can also be defined in terms of [[vapour pressure]] as the temperature at which vapour pressure of liquid becomes equal to atmospheric pressure.

Boiling point can also be defined in terms of [[vapour pressure]] as the temperature at which vapour pressure of liquid becomes equal to atmospheric pressure.

[[Sugar]], [[salt]] or other non-volatile [[solute]]s in water will usually make the boiling point higher. [[Alcohol]], in contrast, is a volatile chemical that lowers the boiling point of water. Even a large amount dissolved in the water will usually make only small changes in the boiling point.

[[Sugar]], [[salt]] or other non-volatile [[solute]]s in water will usually make the boiling point higher. [[Alcohol]], in contrast, is a volatile chemical that lowers the boiling point of water. Even a large amount of matter dissolved in water will usually make only small changes in the boiling point.

 

 

== Boiling Point Media ==

== Boiling Point Media ==

File:Boilingkettle.jpg|Water boiling at 99.3 °C (210.8 °F) at 215 m (705 ft) elevation

File:Boilingkettle.jpg|Water boiling at 99.3 °C (210.8 °F) at 215 m (705 ft) elevation

File:11. Температурата и вриењето на течност.ogv|Demonstration of the lower boiling point of water at lower pressure, achieved by using a [[vacuum pump]].

File:11. Температурата и вриењето на течност.ogv|Demonstration of the lower boiling point of alcohol at lower pressure, achieved by using a [[vacuum pump]].

File:vapor_pressure_chart.svg|A log-lin vapor pressure chart for various liquids

File:vapor_pressure_chart.svg|A log-lin vapor pressure chart for various liquids

File:Binary Boiling Point Diagram new.svg|'''Binary boiling point diagram''' of two hypothetical only weakly interacting components without an [[azeotrope]]

File:Binary Boiling Point Diagram new.svg|'''Binary boiling point diagram''' of two hypothetical only weakly interacting components without an [[azeotrope]]

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{{States of matter}}

{{States of matter}}

[[Category:Thermodynamics]]

[[Category:Thermodynamics]]

[[Category:Basic physics ideas]]

[[Category:Basic physics ideas]]