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Barometric pressure is the weight of an overlying air mass in a particular area. Itâs synonymous with atmospheric pressure. Meteorologists monitor barometric readings to predict weather changes; shifts in the barometer can indicate the approach of a high-pressure (usually fair-weather) or low-pressure (more unsettled) system.
A barometer is an instrument used to measure air pressure and track weather systems. The most common unit of measurement used in barometers is the millibar (mb).1  What Is a High or Low Reading in Barometric Pressure?2  How to Adjust the Altitude for a Barometer.he two types of barometers are mercury and aneroid. In a mercury barometer, millibars measure how high the mercury column climbs a vertical glass tube. Aneroid barometers donât use liquid of any kind, instead employing a flexible-walled evacuated capsule.