Air pressure is the force exerted on a unit area of the Earth's surface by the mass of air above it.
Air pressure is measured using a barometer, measured in millibars (mb).
Air pressure is considered high if it is more than 1013 mb and considered low if it is less than 1013 mb
The measurement of air pressure can be used to produce a weather map or a synoptic chart.
Factors Affecting Air Pressure
Altitude
The higher the altitude, the lower the air pressure
At a higher altitude, there is a smaller mass of air above compared to the mass of air at a lower altitude. Therefore, the air is less dense so the air pressure is lower
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