atmospheres
the user preferred pressure unit
hectoPascal (* 10^2 Pa); also known as millibars, but formatted differently
inches of mercury
invalid unit
kiloPascal (* 10^3 Pa)
millibars; same as %GWEATHER_PRESSURE_UNIT_HPA
millimeters of mercury
The measure unit to use for atmospheric pressure values, when retrieved by gweather_info_get_value_pressure().