Air Pressure in Millibars
Atmospheric pressure, also known as barometric pressure, is the pressure within the atmosphere of Earth (or that of another planet). In most circumstances atmospheric pressure is closely approximated by the hydrostatic pressure caused by the weight of air above the measurement point. As elevation increases, there is less overlying atmospheric mass, so that atmospheric pressure decreases with increasing elevation. Pressure measures force per unit area, with SI units of Pascals (1 pascal = 1 newton per square metre, 1 N/m^2).
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Point Forecast: Amf Ohare IL 41.98N 87.9W
forecast.weather.gov … forecast graph O’Hare [MENU]
forecast.weather.gov … forecast graph O’Hare
Sample Google Air Pressure Conversion from millibars (mb) to inches of Mercury (in Hg) …
1020 mb to in hg = 30.12058 in Hg