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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 measures atmospheric pressure. It is measured in various units, one of the oldest being inches of mercury. Other units include pounds per square inch (PSI) kilo-Pascals (kPa) and atmospheres (ATM). Standard pressure is 29.92 inches of mercury, 14.7 PSI, 100 kPa or 1 ATM. Lower barometer readings are generally associated with less stable weather (as in, low pressure system), while higher ones are generally associated with more stable weather (as in, high pressure system).