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  2. Atmospheric pressure - Wikipedia

    en.wikipedia.org/wiki/Atmospheric_pressure

    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 ]

  3. Atmosphere of Earth - Wikipedia

    en.wikipedia.org/wiki/Atmosphere_of_Earth

    At heights over 100 km, an atmosphere may no longer be well mixed. Then each chemical species has its own scale height. In summary, the mass of Earth's atmosphere is distributed approximately as follows: [43] 50% is below 5.6 km (18,000 ft), 90% is below 16 km (52,000 ft), 99.99997% is below 100 km (62 mi; 330,000 ft), the Kármán line.

  4. International Standard Atmosphere - Wikipedia

    en.wikipedia.org/wiki/International_Standard...

    The U.S. Standard Atmosphere is a set of models that define values for atmospheric temperature, density, pressure and other properties over a wide range of altitudes. The first model, based on an existing international standard, was published in 1958 by the U.S. Committee on Extension to the Standard Atmosphere, [ 9 ] and was updated in 1962 ...

  5. Kármán line - Wikipedia

    en.wikipedia.org/wiki/Kármán_line

    In contrast, Earth satellites with perigees below 80 km are highly unlikely to complete their next orbit. It is noteworthy that meteors (travelling much more quickly) usually disintegrate in the 70–100 km altitude range, adding to the evidence that this is the region where the atmosphere becomes important.

  6. Scale height - Wikipedia

    en.wikipedia.org/wiki/Scale_height

    The earth atmosphere's scale height is about 8.5 km, as can be confirmed from this diagram of air pressure p by altitude h: At an altitude of 0, 8.5, and 17 km, the pressure is about 1000, 370, and 140 hPa, respectively.

  7. Effects of high altitude on humans - Wikipedia

    en.wikipedia.org/wiki/Effects_of_high_altitude...

    Atmospheric pressure decreases following the Barometric formula with altitude while the O 2 fraction remains constant to about 100 km (62 mi), so pO 2 decreases with altitude as well. It is about half of its sea-level value at 5,000 m (16,000 ft), the altitude of the Everest Base Camp , and only a third at 8,848 m (29,029 ft), the summit of ...

  8. Outer space - Wikipedia

    en.wikipedia.org/wiki/Outer_space

    The Earth's atmospheric pressure drops to about 0.032 Pa at 100 kilometres (62 miles) of altitude, [36] ... [16] is set at an altitude of 100 km (62 mi) ...

  9. Orders of magnitude (pressure) - Wikipedia

    en.wikipedia.org/wiki/Orders_of_magnitude_(pressure)

    Lung air pressure difference moving the normal breaths of a person (only 0.3% of standard atmospheric pressure) [35] [36] 400–900 Pa 0.06–0.13 psi Atmospheric pressure on Mars, < 1% of atmospheric sea-level pressure on Earth [37] 610 Pa 0.089 psi Partial vapor pressure at the triple point of water (611.657 Pa) [38] [39] 10 3 Pa