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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 ]
Theories tracing links of the principles of composition in Vastu Shastra and the Indus Valley civilization have been made, but scholar Kapila Vatsyayan considers this speculation since the Indus Valley script remains undeciphered. [21] According to Chakrabarti, Vastu Vidya is as old as the Vedic period and linked to the ritual architecture. [22]
Decrease in air pressure when going from Earth sea level to 1000 m elevation [citation needed] +13 kPa +1.9 psi High air pressure for human lung, measured for trumpet player making staccato high notes [48] < +16 kPa +2.3 psi Systolic blood pressure in a healthy adult while at rest (< 120 mmHg) (gauge pressure) [44] +19.3 kPa +2.8 psi
The U.S. Standard Atmosphere is a static atmospheric model of how the pressure, temperature, density, and viscosity of the Earth's atmosphere change over a wide range of altitudes or elevations. The model, based on an existing international standard, was first published in 1958 by the U.S. Committee on Extension to the Standard Atmosphere, and ...
Highest air pressure: 20 January 2020, Abbeville, Somme 1049.7 hPa [185] [186] Previously: 3 March 1990, Pointe de Chémoulin, Saint-Nazaire Loire-Atlantique 1048.9 hPa. [187] Lowest air pressure: 25 February 1989, Cap de La Hague, Cherbourg 951.8 hPa. [187] though other listed figures predate Météo-France's records. [citation needed]
at each geopotential altitude, where g is the standard acceleration of gravity, and R specific is the specific gas constant for dry air (287.0528J⋅kg −1 ⋅K −1). The solution is given by the barometric formula. Air density must be calculated in order to solve for the pressure, and is used in calculating dynamic pressure for moving vehicles.
The word for air (vāyu) or wind (pavana) is one of the classical elements in Hinduism. The Sanskrit word Vāta literally means 'blown'; Vāyu, 'blower' and Prāna, 'breathing' (viz. the breath of life, cf. the *an- in animate). Hence, the primary referent of the word is the 'deity of life', who is sometimes for clarity referred to as Mukhya ...
Air density, like air pressure, decreases with increasing altitude. It also changes with variations in atmospheric pressure, temperature and humidity . At 101.325 kPa (abs) and 20 °C (68 °F), air has a density of approximately 1.204 kg/m 3 (0.0752 lb/cu ft), according to the International Standard Atmosphere (ISA).