Calculate mixing ratio

Calculate mixing ratio \(w\) (g/kg) from vapor pressure \(e\) (hPa) and air pressure \(p\) (hPa).

Usage

cal_mixing_ratio(e, p)

Arguments

e

Numeric. Vapor pressure in hectoPascal (hPa).

p

Numeric. Air pressure in hectoPascal (hPa).

Value

Numeric value of mixing ratio in g/kg.

Details

Mixing ratio \(w\) (g/kg) is defined as the mass of moisture per mass of dry air:

$$q = \frac{0.622 \cdot e \cdot 1000}{p - e}$$

where \(e\) is the vapor pressure (hPa), and \(p\) is the air pressure (hPa).

References

Davis, Robert E., Glenn R. McGregor, and Kyle B. Enfield. “Humidity: A Review and Primer on Atmospheric Moisture and Human Health.” Environmental Research 144 (January 2016): 106–16. https://doi.org/10.1016/j.envres.2015.10.014.

Examples

cal_mixing_ratio(e = 12, p = 1013.25)
#> [1] 7.454682