Meteorological instruments -- Pressure
A barometer should be hung or placed in a room in which the temperature is constant or changes only slowly. It should be shielded from direct sunshine at all times and should not be placed near any heating apparatus or where there is a draught.
In order to compare pressure levels measured made at weather stations at different altitudes, they are usually corrected to the mean sea level pressure.
Conversion factors: | |||
1 hPa = 1 mbar
= 0.750 mm Hg |
1 mbar = 1 hPa
= 0.750 mm Hg |
1 mm Hg = 1.333 hPa
= 1.333 mbar |