weatherwiz Posted October 11, 2017 Share Posted October 11, 2017 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? Link to comment Share on other sites More sharing options...
isohume Posted October 12, 2017 Share Posted October 12, 2017 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. Link to comment Share on other sites More sharing options...
weatherwiz Posted October 14, 2017 Author Share Posted October 14, 2017 Thank you for the explanation! Link to comment Share on other sites More sharing options...
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