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Analyzing skew-t's to find vapor pressure

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The other day in class we were looking at how to use skew-t's to determine such things such as LCL, CCL, LFC, etc and we came upon vapor pressure.  Does anyone know why you always lift the isotherm up to the 622mb level?  

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I always hated that too. It stems from the ratio of the gas constant of dry air to water vapor, which is 0.622.  The logarithmic design of the skew-T allows for the calculation of vapor pressure using the 622 mb level. It works mathematically and if you mess around with the ideal gas law, you can derive it.    

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