Calculate the saturation mixing ratio of water vapor.
This calculation is given total atmospheric pressure and air temperature.
total_press (pint.Quantity) – Total atmospheric pressure
temperature (pint.Quantity) – Air temperature
pint.Quantity – Saturation mixing ratio, dimensionless
This function is a straightforward implementation of the equation given in many places,
such as [Hobbs1977] pg.73:
Changed in version 1.0: Renamed tot_press parameter to total_press