3. Atmospheric pressure
3.1 Definitions. Units
Atmospheric pressure in the International System of Units (SI) is defined as the force exerted by the weight of air (or more generally, a gas mixture) on a given surface, divided by that surface area.
The base unit of pressure in the SI system is the pascal (Pa), where 1 Pa = 1 newton per square meter (N/m 2 ).
The unit of pressure used in meteorology is the hectopascal (hPa), but many barometers are still calibrated in other units.
The main conversion factors are:
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Atmospheric pressure
Temperature
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