# mixing_ratio_from_relative_humidity¶

metpy.calc.mixing_ratio_from_relative_humidity(pressure, temperature, relative_humidity)[source]

Calculate the mixing ratio from relative humidity, temperature, and pressure.

Parameters
• pressure (pint.Quantity) – Total atmospheric pressure

• temperature (pint.Quantity) – Air temperature

• relative_humidity (array_like) – The relative humidity expressed as a unitless ratio in the range [0, 1]. Can also pass a percentage if proper units are attached.

Returns

pint.Quantity – Mixing ratio (dimensionless)

Notes

Formula adapted from [Hobbs1977] pg. 74.

$w = (rh)(w_s)$
• $$w$$ is mixing ratio

• $$rh$$ is relative humidity as a unitless ratio

• $$w_s$$ is the saturation mixing ratio

Changed in version 1.0: Changed signature from (relative_humidity, temperature, pressure)