density¶
- metpy.calc.density(pressure, temperature, mixing_ratio, molecular_weight_ratio=<Quantity(0.62195691, 'dimensionless')>)¶
Calculate density.
This calculation must be given an air parcel’s pressure, temperature, and mixing ratio. The implementation uses the formula outlined in [Hobbs2006] pg.67.
- Parameters
pressure (
pint.Quantity
) – Total atmospheric pressuretemperature (
pint.Quantity
) – Air temperaturemixing_ratio (
pint.Quantity
) – Mass mixing ratio (dimensionless)molecular_weight_ratio (
pint.Quantity
or float, optional) – The ratio of the molecular weight of the constituent gas to that assumed for air. Defaults to the ratio for water vapor to dry air. (\(\epsilon\approx0.622\))
- Returns
pint.Quantity
– Corresponding density of the parcel
Notes
\[\rho = \frac{p}{R_dT_v}\]Changed in version 1.0: Renamed
mixing
parameter tomixing_ratio