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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 ]
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 ...
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When atmospheric pressure is measured by a barometer, the pressure is also referred to as the "barometric pressure". Assume a barometer with a cross-sectional area A, a height h, filled with mercury from the bottom at Point B to the top at Point C. The pressure at the bottom of the barometer, Point B, is equal to the atmospheric pressure.
The JMA had already declared that Damrey reached its peak intensity with 10-minute sustained winds of 130 km/h (80 mph) and a minimum barometric pressure of 970 hPa. [17] Six hours later, microwave images showed the eye becoming well-defined and an improved storm structure with a large centralized convective mass occluding to its center. [18]
Originally, many thước of varying lengths were in use in Vietnam, each used for different purposes. According to Hoàng Phê (1988), [1] the traditional system of units had at least two thước of different lengths before 1890, [2] the thước ta (lit. "our ruler") or thước mộc ("wooden ruler"), equal to 0.425 metres (1 ft 4.7 in), and the thước đo vải ("ruler for measuring ...
Quảng Ninh, anglicized as Quangninh, is a province along the northeastern coast of Vietnam.It is about 153 km (95 mi) east of Hanoi, comprising four cities, two district-level towns and seven rural districts.
The Danish Meteorological Institute report record barometric pressure for Denmark (since 1874) as: Highest air pressure: 23 January 1907, Skagen and Copenhagen 1062.2 hPa. [106] [107] Lowest air pressure: 20 February 1907, Skagen 943.5 hPa. [106] Danish records both occurred within a month during the same winter, and same winter as Norwegian ...