Difference between revisions of "Vapor pressure"

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{{stub}}The pressure exerted by the vapor which sits on top of any liquid.<ref>Wile, Dr. Jay L. ''Exploring Creation With Chemistry''. Apologia Educational Ministries, Inc. 1998</ref>
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'''Vapor pressure''' is the [[pressure]] exerted by a vapor in a vapor-liquid [[equilibrium]] in a closed vessel. The relationship between a pure substance's vapor pressure and its [[temperature]] is shown on the liquid-vapor line on a [[phase diagram]]; the vapor pressure always increases as the temperature increases. <ref name="atkins">Atkins, Peter and Julio de Paula. ''Physical Chemistry Volume 1, 8e.'' Oxford University Press: 2006.</ref>
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When the pressure on a system is equal to the vapor pressure of a substance, that substance is considered [[boiling]]. Thus, the [[normal boiling temperature]] is defined as the the temperature at which a substances vapor pressure equals 1 [[atmosphere]].
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==See Also==
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*[[Phase diagram]]
  
 
==References==
 
==References==

Revision as of 20:18, 29 September 2007

Vapor pressure is the pressure exerted by a vapor in a vapor-liquid equilibrium in a closed vessel. The relationship between a pure substance's vapor pressure and its temperature is shown on the liquid-vapor line on a phase diagram; the vapor pressure always increases as the temperature increases. [1]

When the pressure on a system is equal to the vapor pressure of a substance, that substance is considered boiling. Thus, the normal boiling temperature is defined as the the temperature at which a substances vapor pressure equals 1 atmosphere.

See Also

References

  1. Atkins, Peter and Julio de Paula. Physical Chemistry Volume 1, 8e. Oxford University Press: 2006.