Function bryan1 

pub fn bryan1(
    temperature: f32,
    pressure: f32,
    vapour_pressure: f32,
) -> Result<f32, InputError>

Formula for computing equivalent potential temperature of unsaturated air from temperature, pressure and vapour pressure.

Derived by G. H. Bryan (2008) (doi:10.1175/2008MWR2593.1)

Errors

Returns InputError::OutOfRange when one of inputs is out of range.
Valid temperature range: 253K - 324K
Valid pressure range: 100Pa - 150000Pa
Valid vapour_pressure range: 0Pa - 10000Pa