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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 ]
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.
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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 ...
The Vietnamese Wikipedia (Vietnamese: Wikipedia tiếng Việt) is the Vietnamese-language edition of Wikipedia, a free, publicly editable, online encyclopedia supported by the Wikimedia Foundation. Like the rest of Wikipedia, its content is created and accessed using the MediaWiki wiki software.
In the bottom centre is the aneroid (large circular silver object). As the pressure increases, the aneroid is pushed down causing the arm to move up and leave a trace on the paper. As the pressure decreases, the spring lifts the aneroid and the arm moves down. After three days the drum to which the graph is attached is removed.
Many place-names in Vietnam incorporate the word Long, or Rồng ("dragon" in Vietnamese): Hạ Long Bay (vịnh Hạ Long, lit. "Bay of Descending Dragon"), the section of the Mekong river flowing through Vietnam contains 9 branches and is called Cửu Long ("nine dragons"); Hàm Rồng Bridge (lit."Bridge of Dragon Jaw"), Long Biên Bridge ...
A Bảo Đại period document issued by the Imperial Clan Court which mentions the Tết Trung Thu. Tết Trung Thu originated from Chinese culture, with three main legends that are associated with the festival: the story of Chang'e and Hou Yi, Emperor Tang Ming Huang's ascent to the moon in China, and the story of Uncle Cuội of Vietnam.