# virtual_temperature¶

metpy.calc.virtual_temperature(temperature, mixing_ratio, molecular_weight_ratio=<Quantity(0.62195691, 'dimensionless')>)

Calculate virtual temperature.

This calculation must be given an air parcel’s temperature and mixing ratio. The implementation uses the formula outlined in [Hobbs2006] pg.80.

Parameters
• temperature (pint.Quantity) – Air temperature

• mixing_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 virtual temperature of the parcel

Notes

$T_v = T \frac{\text{w} + \epsilon}{\epsilon\,(1 + \text{w})}$

Changed in version 1.0: Renamed mixing parameter to mixing_ratio