Function metfor::vapor_pressure_ice

pub fn vapor_pressure_ice<T>(frost_point: T) -> Option<HectoPascal> where
    T: Temperature + PartialOrd,
    Celsius: From<T>, 

Get the vapor pressure over ice.

Alduchov, O.A., and Eskridge, R.E. Improved Magnus` form approximation of saturation vapor pressure. United States: N. p., 1997. Web. doi:10.2172/548871.

Returns: The vapor pressure of water vapor.