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[[Image:Kohler curves.png|right|thumb|250px||Kohler curves showing how the critical diameter and supersaturation are dependent upon the amount of solute. It's assumed here that the solute is a perfect sphere of sodium chloride.]]'''Köhler theory''' describes the process in which [[water vapor]] condenses and forms liquid cloud drops, and is based on equilibrium [[thermodynamics]]. It combines the [[Kelvin effect]], which describes the change in saturation vapor pressure due to a curved surface, and [[Raoult's Law]], which relates the saturation vapor pressure to the solute.<ref>{{cite web |title=Köhler Theory 101 | url=http://nenes.eas.gatech.edu/Experiments/KTA%5B1%5D_files/page0001.htm | accessdate=2012-06-26}}</ref> It is an important process in the field of [[cloud physics]]. It was initially published in 1936 by Hilding Köhler, Professor of Meteorology in the Uppsala University.
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Köhler equation:
 
<math>\ln \left ( \frac{p_{w}(D_{p})}{p^{0}} \right ) = \frac{4M_{w}\sigma_{w}}{RT\rho_{w}D_{p}} - \frac{6n_{s}M_{w}}{\pi\rho_{w}D_{p}^{3}}</math>
 
where <math>p_w</math> is the droplet water vapor pressure, <math>p^0</math> is the corresponding saturation vapor pressure over a flat surface, <math>\sigma_w</math> is the droplet [[surface tension]], <math>\rho_w</math> is the density of pure water, <math>n_s</math> is the moles of solute, <math>M_w</math> is the molecular weight of water, and <math>D_p</math> is the cloud drop diameter.
 
== Köhler curve ==
The Köhler curve is the visual representation of the Köhler equation. It shows the supersaturation at which the cloud drop is in equilibrium with the environment over a range of droplet diameters. The exact shape of the curve is dependent upon the amount and composition of the solute. The Köhler curves where the solute is [[sodium chloride]] are different than when the solute is [[sodium nitrate]] or [[ammonium sulfate]].
 
The figure above shows three Köhler curves of sodium chloride. Consider a point on the graph where the wet diameter is 0.1 micrometers and the supersaturation is 0.35%. Since the [[relative humidity]] is above 100%, the droplet will grow until it is in thermodynamic equilibrium. As the droplet grows, it never encounters equilibrium, and thus grows without bound. However, if the supersaturation is only 0.3%, the drop will only grow until about 0.5 micrometers. The supersaturation at which the drop will grow without bound is called the critical supersaturation. The diameter at which the curve peaks is called the critical diameter.
 
== References ==
{{reflist}}
*Köhler, H., 1936. The nucleus in and the growth of hygroscopic droplets. Trans.Faraday Soc., 32, 1152–1161.
* Rogers, R. R., M. K. Yau, 1989. A Short Course in Cloud Physics, 3rd Ed. Pergamon Press. 293 pp.
*Young, K. C., 1993. Microphysical Processes in Clouds. Oxford Press. 427 pp.
*Wallace, J. M., P.V. Hobbs, 1977. Atmospheric Science: An Introductory Survey. Academic Press. 467 pp.
 
{{DEFAULTSORT:Kohler Theory}}
[[Category:Cloud and fog physics]]
 
 
{{climate-stub}}

Revision as of 10:05, 21 February 2014

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