vapor_pressure#
- metpy.calc.vapor_pressure(pressure, mixing_ratio)[source]#
Calculate water vapor (partial) pressure.
Given total
pressure
and water vapormixing_ratio
, calculates the partial pressure of water vapor.- Parameters:
pressure (
pint.Quantity
) – Total atmospheric pressuremixing_ratio (
pint.Quantity
) – Dimensionless mass mixing ratio
- Returns:
pint.Quantity
– Ambient water vapor (partial) pressure in the same units aspressure
Examples
>>> from metpy.calc import vapor_pressure >>> from metpy.units import units >>> vapor_pressure(988 * units.hPa, 18 * units('g/kg')).to('hPa') <Quantity(27.789371, 'hectopascal')>
See also
Notes
This function is a straightforward implementation of the equation given in many places, such as [Hobbs1977] pg.71:
\[e = p \frac{r}{r + \epsilon}\]Changed in version 1.0: Renamed
mixing
parameter tomixing_ratio
Examples using metpy.calc.vapor_pressure
#
Dewpoint and Mixing Ratio