August-Roche-Magnus 6.1094 exp(17.625 x T)/(T + 243.04)

Buck (1981) 6.1121 exp(17.502 x T)/(T + 240.97)

US space agency NASA substituted the August-Roche-Magnus approximation for calibration purposes in its CYGNSS satellite system which monitors hurricane intensity (see Updates – June 2015)

See link below for a comparative review of SVP approximation formulae

https://www.eas.ualberta.ca/jdwilson/EAS372_13/Vomel_CIRES_satvpformulae.html

In the formula, the numerator is 6.112 x e^[(17.67 x T)/(T+243.5)] x rh x 2.1674. I don’t understand why we cannot simplify the factors 6.112 and 2.1674 further to 13.2471. Where’s my error? ]]>