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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.
Standard sea-level pressure is expressed as 1013.2 millibars. Isobars are lines on a weather map that connect places of equal air pressure. A mercury barometer measures air pressure using a column of mercury in a glass tube that is sealed at one end and inverted in a dish of mercury. mercury barometer measures atmospheric pressure in inches of mercury, the height of the column of mercury in the barometer. Standard atmospheric pressure at sea level equals 29.92 inches of mercury.