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Atmospheric pressure
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Static pressure exerted by the weight of the atmosphere
"Air pressure" redirects here. For the pressure of air in other systems, see Pressure.
Atmospheric pressure, sometimes also called barometric pressure, is the pressure within the atmosphere of Earth (or that of another planet). In most circumstances atmospheric pressure is closely approximated by the hydrostatic pressure caused by the weight of air above the measurement point. As elevation increases, there is less overlying atmospheric mass, so that atmospheric pressure decreases with increasing elevation. Pressure measures force per unit area, with SI units of Pascals (1 pascal = 1 newton per square metre, 1 N/m2). On average, a column of air with a cross-sectional area of 1 square centimetre (cm2), measured from mean (average) sea level to the top of Earth's atmosphere, has a mass of about 1.03 kilogram and exerts a force or "weight" of about 10.1 newtons or 2.37 lbf, resulting in a pressure at sea level of about 10.1 N/cm2 or 101 kN/m2 (101 kilopascals, kPa). A column of air with a cross-sectional area of 1 in2 (6.45 cm2) would have a mass of about 6.65 kg and a weight of about 65.4 N or 14.7 lbf, resulting in a pressure of 10.1 N/cm2 or 14.7 lbf/in2.
Contents
[hide]
1 Mechanism
2 Standard atmosphere
3 Mean sea-level pressure
4 Altitude variation
5 Local variation
6 Records
7 Measurement based on depth of water
8 Boiling point of water
9 Measurement and maps
10 See also
11 References
12 External links
12.1 Experiments
Mechanism[edit]
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Atmospheric pressure is caused by the gravitational attraction of the planet on the atmospheric gases above the surface, and is a function of the mass of the planet, the radius of the surface, and the amount of gas and its vertical distribution in the atmosphere.[1][2] It is modified by the planetary rotation and local effects such as wind velocity, density variations due to temperature and variations in composition.[citation needed]
Standard atmosphere[edit]
The standard atmosphere (symbol: atm) is a unit of pressure defined as 101325 Pa (1.01325 bar), equivalent to 760 mmHg (torr), 29.92 inches Hg and 14.696 psi.[3]
Mean sea-level pressure[edit]
15-year average mean sea-level pressure for June, July, and August (top) and December, January, and February (bottom). ERA-15 re-analysis.
Kollsman-type barometric aircraft altimeter (as used in North America) displaying an altitude of 80 ft (24 m).
The mean sea-level pressure (MSLP) is the average atmospheric pressure at sea level. This is the atmospheric pressure normally given in weather reports on radio, television, and newspapers or on the Internet. When barometers in the home are set to match the local weather reports, they measure pressure adjusted to sea level, not the actual local atmospheric pressure.
The altimeter setting in aviation is an atmospheric pressure adjustment.
Average sea-level pressure is 1013.25 mbar (101.325 kPa; 29.921 inHg; 760.00 mmHg). In aviation, weather reports (METAR), QNH is transmitted around the world in millibars or hectopascals (1 hectopascal = 1 millibar), except in the United States, Canada, and Colombia where it is reported in inches (to two decimal places) of mercury. The United States and Canada also report sea-level pressure SLP, which is adjusted to sea level by a different method, in the remarks section, not in the internationally transmitted part of the code, in hectopascals or millibars.[4] However, in Canada's public weather reports, sea level pressure is instead reported in kilopascals.[5]
In the US weather code remarks, three digits are all that are transmitted; decimal points and the one or two most significant digits are omitted: 1013.2 mbar (101.32 kPa) is transmitted as 132; 1000.0 mbar (100.00 kPa) is transmitted as 000; 998.7 mbar is transmitted as 987; etc. The highest sea-level pressure on Earth occurs in Siberia, where the Siberian High often attains a sea-level pressure above 1050 mbar (105 kPa; 31 inHg), with record highs close to 1085 mbar (108.5 kPa; 32.0 inHg). The lowest measurable sea-level pressure is found at the centers of tropical cyclones and tornadoes, with a record low of 870 mbar (87 kPa; 26 inHg) (see Atmospheric pressure records).
Altitude variation[edit]
A very local storm above Snæfellsjökull, showing clouds formed on the mountain by orographic lift
Variation in atmospheric pressure with altitude, computed for 15 °C and 0% relative humidity.
This plastic bottle was sealed at approximately 14,000 feet (4,300 m) altitude, and was crushed by the increase in atmospheric pressure —at 9,000 feet (2,700 m) and 1,000 feet (300 m)— as it was brought down towards sea level.
Pressure varies smoothly from the Earth's surface to the top of the mesosphere. Although the pressure changes with the weather, NASA has averaged the conditions for all parts of the earth year-round. As altitude increases, atmospheric pressure decreases. One can calculate the atmospheric pressure at a given altitude.[6] Temperature and humidity also affect the atmospheric pressure, and it is necessary to know these to compute an accurate figure. The graph at right was developed for a temperature of 15 °C and a relative humidity of 0%.
At low altitudes above sea level, the pressure decreases by about 1.2 kPa for every 100 metres. For higher altitudes within the troposphere, the following equation (the barometric formula) relates atmospheric pressure p to altitude h
p = p 0 ⋅ ( 1 − L ⋅ h T 0 ) g ⋅ M R 0 ⋅ L ≈ p 0 ⋅ ( 1 − g ⋅ h c p ⋅ T 0 ) c p ⋅ M R 0 ≈ p 0 ⋅ exp  ( − g ⋅ h ⋅ M T 0 ⋅ R 0 ) {\displaystyle {\begin{aligned}p&=p_{0}\cdot \left(1-{\frac {L\cdot h}{T_{0}}}\right)^{\frac {g\cdot M}{R_{0}\cdot L}}\\&\approx p_{0}\cdot \left(1-{\frac {g\cdot h}{c_{\text{p}}\cdot T_{0}}}\right)^{\frac {c_{\text{p}}\cdot M}{R_{0}}}\approx p_{0}\cdot \exp \left(-{\frac {g\cdot h\cdot M}{T_{0}\cdot R_{0}}}\right)\end{aligned}}}
where the constant parameters are as described below:
Parameter
Description
Value
p0 Sea level standard atmospheric pressure 101325 Pa
L Temperature lapse rate, = g/cp for dry air 0.0065 K/m
cp Constant-pressure specific heat ~1007 J/(kg·K)
T0 Sea level standard temperature 288.15 K
g Earth-surface gravitational acceleration 9.80665 m/s2
M Molar mass of dry air 0.0289644 kg/mol
R0 Universal gas constant 8.31447 J/(mol·K)
Local variation[edit]
Hurricane Wilma on 19 October 2005; 882 hPa (12.79 psi) in the storm's eye
Atmospheric pressure varies widely on Earth, and these changes are important in studying weather and climate. See pressure system for the effects of air pressure variations on weather.
Atmospheric pressure shows a diurnal or semidiurnal (twice-daily) cycle caused by global atmospheric tides. This effect is strongest in tropical zones, with an amplitude of a few millibars, and almost zero in polar areas. These variations have two superimposed cycles, a circadian (24 h) cycle and semi-circadian (12 h) cycle.
Records[edit]
The highest adjusted-to-sea level barometric pressure ever recorded on Earth (above 750 meters) was 1084.8 hPa (32.03 inHg) measured in Tosontsengel, Mongolia on 19 December 2001.[7] The highest adjusted-to-sea level barometric pressure ever recorded (below 750 meters) was at Agata in Evenk Autonomous Okrug, Russia (66°53’ N, 93°28’ E, elevation: 261 m, 856 ft) on 31 December 1968 of 1083.8 hPa (32.005 inHg).[8] The discrimination is due to the problematic assumptions (assuming a standard lapse rate) associated with reduction of sea level from high elevations.[7]
The Dead Sea, the lowest place on Earth at 430 metres (1,410 ft) below sea level, has a correspondingly high typical atmospheric pressure of 1065 hPa.[9]
The lowest non-tornadic atmospheric pressure ever measured was 870 hPa (0.858 atm; 25.69 inHg), set on 12 October 1979, during Typhoon Tip in the western Pacific Ocean. The measurement was based on an instrumental observation made from a reconnaissance aircraft.[10]
Measurement based on depth of water[edit]
One atmosphere (101.325 kPa or 14.7 psi) is also the pressure caused by the weight of a column of fresh water of approximately 10.3 m (33.8 ft). Thus, a diver 10.3 m underwater experiences a pressure of about 2 atmospheres (1 atm of air plus 1 atm of water). Conversely, 10.3 m is the maximum height to which water can be raised using suction under standard atmospheric conditions.
Low pressures such as natural gas lines are sometimes specified in inches of water, typically written as w.c. (water column) gauge or w.g. (inches water gauge). A typical gas-using residential appliance in the US is rated for a maximum of 14 w.g., which is approximately 1048.37 hPa. Similar metric units with a wide variety of names and notation based on millimetres, centimetres or metres are now less commonly used.
Boiling point of water[edit]
Boiling water
Pure water boils at 100 °C (212 °F) at earth's standard atmospheric pressure. The boiling point is the temperature at which the vapor pressure is equal to the atmospheric pressure around the water.[11] Because of this, the boiling point of water is lower at lower pressure and higher at higher pressure. Cooking at high elevations, therefore, requires adjustments to recipes[12] or pressure cooking. A rough approximation of elevation can be obtained by measuring the temperature at which water boils; in the mid-19th century, this method was used by explorers.[13]
Measurement and maps[edit]
An important application of the knowledge that atmospheric pressure varies directly with altitude was in determining the height of hills and mountains thanks to the availability of reliable pressure measurement devices. While in 1774, Maskelyne was confirming Newton's theory of gravitation at and on Schiehallion in Scotland (using plumb bob deviation to show the effect of "gravity") and accurately measure elevation, William Roy using barometric pressure was able to confirm his height determinations, the agreement being to within one meter (3.28 feet). This method became and continues to be useful for survey work and map making. This early "application of science" gave people insight into how science could easily be put to practical use.[14]
See also[edit]
Underwater diving portal
Atmosphere (unit)
Barometric formula
Barotrauma – physical damage to body tissues caused by a difference in pressure between an air space inside or beside the body and the surrounding gas or liquid.
Cabin pressurization
Effects of high altitude on humans
High-pressure area
Atmosphere of Earth
International Standard Atmosphere - a tabulation of typical variation of principal thermodynamic variables of the atmosphere (pressure, density, temperature, etc.) with altitude, at middle latitudes.
Low-pressure area
NRLMSISE-00
Plenum chamber
Pressure
Subtropical ridge
References[edit]
Jump up ^ "atmospheric pressure (encyclopedic entry)". National Geographic. Retrieved 28 February 2018.
Jump up ^ "Q & A: Pressure - Gravity Matters?". Department of Physics. University of Illinois Urbana-Champaign. Retrieved 28 February 2018.
Jump up ^ International Civil Aviation Organization. Manual of the ICAO Standard Atmosphere, Doc 7488-CD, Third Edition, 1993. ISBN 92-9194-004-6.
Jump up ^ Sample METAR of CYVR Nav Canada
Jump up ^ Montreal Current Weather, CBC Montreal, Canada, retrieved 2014-03-30
Jump up ^ A quick derivation relating altitude to air pressure Archived 2011-09-28 at the Wayback Machine. by Portland State Aerospace Society, 2004, accessed 05032011
^ Jump up to: a b World: Highest Sea Level Air Pressure Above 750 m, Wmo.asu.edu, 2001-12-19, archived from the original on 2012-10-17, retrieved 2013-04-15
Jump up ^ World: Highest Sea Level Air Pressure Below 750 m, Wmo.asu.edu, 1968-12-31, archived from the original on 2013-05-14, retrieved 2013-04-15
Jump up ^ Kramer, MR; Springer C; Berkman N; Glazer M; Bublil M; Bar-Yishay E; Godfrey S (March 1998). "Rehabilitation of hypoxemic patients with COPD at low altitude at the Dead Sea, the lowest place on earth" (PDF). Chest. 113 (3): 571–575. doi:10.1378/chest.113.3.571. PMID 9515826. Archived from the original (PDF) on 2013-10-29. PMID 9515826
Jump up ^ Chris Landsea (2010-04-21). "Subject: E1), Which is the most intense tropical cyclone on record?". Atlantic Oceanographic and Meteorological Laboratory. Archived from the original on 6 December 2010. Retrieved 2010-11-23.
Jump up ^ Vapour Pressure, Hyperphysics.phy-astr.gsu.edu, retrieved 2012-10-17
Jump up ^ High Altitude Cooking, Crisco.com, 2010-09-30, archived from the original on 2012-09-07, retrieved 2012-10-17
Jump up ^ Berberan-Santos, M. N.; Bodunov, E. N.; Pogliani, L. (1997). "On the barometric formula". American Journal of Physics. 65 (5): 404–412. Bibcode:1997AmJPh..65..404B. doi:10.1119/1.18555.
Jump up ^ Hewitt, Rachel, Map of a Nation – a Biography of the Ordnance Survey ISBN 1-84708-098-7
External links[edit]
1976 Standard Atmosphere from NASA
Source code and equations for the 1976 Standard Atmosphere
A mathematical model of the 1976 U.S. Standard Atmosphere
Calculator using multiple units and properties for the 1976 Standard Atmosphere
Calculator giving standard air pressure at a specified altitude, or altitude at which a pressure would be standard
Current map of global mean sea-level pressure
Atmospheric calculator and Geometric to Pressure altitude converter
Experiments[edit]
Movies on atmospheric pressure experiments from Georgia State University's HyperPhysics website – requires QuickTime
Test showing a can being crushed after boiling water inside it, then moving it into a tub of ice cold water.
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values: Атмосферно налягане – Bulgarian

values:
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values:
interlanguage-link interwiki-ca
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values:
interlanguage-link interwiki-cs
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values:
https://de.wikipedia.org/wiki/Luftdruck
Luftdruck – German
de
de
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values:
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values:
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values: Ατμοσφαιρική πίεση – Greek

values:
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values:
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display: none;

values:
interlanguage-link interwiki-eu
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values: فشار جو – Persian

values:
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values:
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values:
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values:
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values:
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values: Մթնոլորտային ճնշում – Armenian

values:
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values: वायुमंडलीय दाब – Hindi

values:
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values:
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values:
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values: לחץ אטמוספירי – Hebrew

values:
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values: ატმოსფერული წნევა – Georgian

values:
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values: Атмосфералық қысым – Kazakh

values:
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values:
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values:
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values: Атмосфера басымы – Kyrgyz

values:
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display: none;

values: ຄວາມກົດອາກາດ – Lao

values:
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values:
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values:
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values:
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values: Атмосферски притисок – Macedonian

values:
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values: അന്തരീക്ഷമർദ്ദം – Malayalam

values:
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values: वातावरणाचा दाब – Marathi

values:
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values: Агаарын даралт – Mongolian

values:
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values:
https://nl.wikipedia.org/wiki/Luchtdruk
Luchtdruk – Dutch
nl
nl
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values:
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values:
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values:
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values:
https://nn.wikipedia.org/wiki/Lufttrykk
Lufttrykk – Norwegian Nynorsk
nn
nn
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values:
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values:
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values:
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values: ਵਾਯੂਮੰਡਲ ਦਬਾਅ – Punjabi

values:
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values:
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values:
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values: Атмосферное давление – Russian

values:
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values:
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values:
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values:
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values: Атмосферски притисак – Serbian

values:
interlanguage-link interwiki-sr
display: none;

values:
interlanguage-link interwiki-sh
display: none;

values:
interlanguage-link interwiki-fi
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values:
https://sv.wikipedia.org/wiki/Lufttryck
Lufttryck – Swedish
sv
sv
interlanguage-link-target

values:
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values: வளிமண்டல அழுத்தம் – Tamil

values:
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values: వాతావరణ పీడనం – Telugu

values:
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values: ความกดอากาศ – Thai

values:
interlanguage-link interwiki-th
display: none;

values:
interlanguage-link interwiki-tr
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values: Атмосферний тиск – Ukrainian

values:
interlanguage-link interwiki-uk
display: none;

values: ہوا کا دباؤ – Urdu

values:
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values:
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values: All languages (initial selection from common choices by you and others)

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