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Inch of mercury (inHg and ″Hg) is a non-SI unit of measurement for pressure. It is used for barometric pressure in weather reports, refrigeration and aviation in the United States. It is the pressure exerted by a column of mercury 1 inch (25.4 mm) in height at the standard acceleration of gravity.
Whitehall is one of Greenville’s oldest residences. It was built by Henry Middleton in 1813 and served as Middleton’s summer home until 1820. Middleton’s father, Arthur Middleton was a signer of the Declaration of Independence, president of Continental Congress, a US Senator, and a member of the SC House of Representatives.
Atmospheric pressure, also known as air pressure or 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 ), which is equivalent to 1,013.25 millibars , [ 1 ] 760 mm Hg , 29.9212 inches Hg , or 14.696 psi . [ 2 ]
Hurricane Opal, the most intense Category 4 hurricane recorded, intensified to reach a minimum pressure of 916 mbar (hPa; 27.05 inHg), [54] a pressure typical of Category 5 hurricanes. [55] Nonetheless, the pressure remains too high to list Opal as one of the ten strongest Atlantic tropical cyclones. [11]
Pressure as a function of the height above the sea level. There are two equations for computing pressure as a function of height. The first equation is applicable to the atmospheric layers in which the temperature is assumed to vary with altitude at a non null lapse rate of : = [,, ()] ′, The second equation is applicable to the atmospheric layers in which the temperature is assumed not to ...
A temperature difference of approximately 13 °C (23 °F) between the lake temperature and the height in the atmosphere (about 1,500 m or 5,000 ft at which barometric pressure measures 850 mbar or 85 kPa) provides for absolute instability and allows vigorous heat and moisture transportation vertically.
The central pressure rapidly dropped 54 millibars (1.6 inHg) from 0000 to 0600 UTC, and at 0800 UTC, a hurricane hunters flight recorded a minimum central pressure of 884 millibars (26.1 inHg) in a dropsonde near the center of the extremely small eye. As the dropsonde did not reach the calm winds in the center, the pressure was estimated at 882 ...
With maximum sustained winds of 160 mph (260 km/h) and a central pressure of 919 mbar (27.14 inHg) at landfall, Michael was the most intense landfalling mainland U.S. hurricane since Camille in 1969, which had a central pressure of 900 mbar (26.58 inHg) at landfall.