Barometric Pressure map for United States. 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. The normal air pressure at sea level is 14.7 pounds per square inch. The standard atmosphere at sea level is a surface temperature of 59 °F or 15 °C and a surface pressure of 29.92 inches of mercury ("Hg) or 1,013.2 mb. Show transcribed image text. See the answer. Scientists consider 1013.2 millibars to be the normal barometric pressure at sea level on a calm day. Mbar:1013.2 ; Hg:29.92 2. Standard atmospheric pressure of 1013.25 mb at 0 m, 226.321 mb at 11,000 m, 54.7489 mb at 20,000 m above mean sea level. Meteorologists use a metric unit for pressure called a millibar and the average pressure at sea level is 1013.25 millibars. Due to the changing atmospheric pressure, a standard reference was developed. Standard atmospheric pressure can also be expressed using different units, including 1013.25 millibars, 1013.25 hectoPascals, 760 millimeters of mercury and 29.92 inches of mercury. What is standard sea-level pressure, in millibars and inches of mercury? Standard sea-level pressure is expressed as 1013.2 millibars. When calculating the barometric pressure for a city located 200 meters above sea level, would you add or subtract units to its barometric reading in order to correct its pressure to sea level… That means pressure applied by this air on the unit area would be 14.7 pounds per square inch. The height relative to sea level conversions are derived using the US Standard Atmosphere 1976 barometric formula for geopotential altitude with the following values[1-6] at heights from 5,000 ft (1524 m) below to 100,000 ft (30,480 m) above mean sea level. Mb In Hg. Pressure and temperature normally decrease as altitude increases. [Figure 4-2] A standard temperature lapse rate is … Local, National and International weather maps, graphs and charts forecasts. A barometer measures in units called millibars, meaning the atmospheric force exerted on one square meter of surface. United States Barometric Pressure Map - WeatherWX.com Maps with barometric pressure readings in millibars (mb) or inches (in). Previous question Next question Transcribed Image Text from this Question. As terrain rises above sea level, the barometric pressure falls as the air’s gas molecules become less dense. Expert Answer . Atmospheric pressure, also known as barometric pressure (after the barometer), is the pressure within the atmosphere of Earth.The standard atmosphere (symbol: atm) is a unit of pressure defined as 101,325 Pa (1,013.25 hPa; 1,013.25 mbar), which is equivalent to 760 mm Hg, 29.9212 inches Hg, or 14.696 psi. In Millibars {mb) And Inches Of Mercury In Hg? 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