⋅ R 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. 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. Pressure varies smoothly from the Earth's surface to the top of the mesosphere. 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. where the constant parameters are as described below: Atmospheric pressure varies widely on Earth, and these changes are important in studying weather and climate. where .

For the pressure of air in other systems, see, "Surface pressure" redirects here. 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). Enter a "Start" value (5, 100 etc). Conversely, 10.3 m is the maximum height to which water can be raised using suction under standard atmospheric conditions. The standard atmosphere (symbol: atm) is a unit of pressure defined as 101,325 Pa (1,013.25 hPa; 1,013.25 mbar), which is equivalent to 760 mm Hg, 29.9212 inches Hg, or 14.696 psi.

For higher altitudes within the troposphere, the following equation (the barometric formula) relates atmospheric pressure p to altitude h: M

[2][3] It is modified by the planetary rotation and local effects such as wind velocity, density variations due to temperature and variations in composition.[4].

[7] This is in contrast to mean sea-level pressure, which involves the extrapolation of pressure to sea-level for locations above or below sea-level. Thus, a diver 10.3 m underwater experiences a pressure of about 2 atmospheres (1 atm of air plus 1 atm of water). For example, to convert 100 psi to atm, divide 100 by 14.6959488, that makes 100 psi is 6.80459639 atm. The average value of surface pressure on Earth is 985 hPa. 0 [1] The atm unit is roughly equivalent to the mean sea-level atmospheric pressure on Earth, that is, the Earth's atmospheric pressure at sea level is approximately 1 atm. − L

The mean sea-level pressure (MSLP) is the atmospheric pressure at mean sea level (PMSL). T h Atmospheric pressure, also known as barometric pressure (after the barometer), is the pressure within the atmosphere of Earth.

p = 101325 (1 - 2.25577 10-5 (10000 m)) 5.25588

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, resulting in a pressure of 10.1 N/cm2 or 101 kN/m2 (101 kilopascals, kPa). For example, to convert 100 psi to atm, divide 100 by 14.6959488, that makes 100 psi is 6.80459639 atm. ⋅

p

Please visit pressure conversion to convert all pressure units. Pressure measures force per unit area, with SI units of Pascals (1 pascal = 1 newton per square metre, 1 N/m2). Although the pressure changes with the weather, NASA has averaged the conditions for all parts of the earth year-round. At low altitudes above sea level, the pressure decreases by about 1.2 kPa (12 hPa) for every 100 metres. L Psi is a pound of force per square inch.

vacuum) in a steam condenser is one such example. This example problem demonstrates how to convert the pressure unit atmospheres to pounds per square inch (psi). William Roy, using barometric pressure, was able to confirm Maskelyne's height determinations, the agreement being to within one meter (3.28 feet). 0
p = air pressure (Pa) h = altitude above sea level (m) Example - Air pressure at Elevation 10000 m. The air pressure at altitude 10000 m can be calculated as. M PSIG -PSI Gauge. For surface pressure in physical chemistry, see. −

exp ⋅ Surface pressure is the atmospheric pressure at a location on Earth's surface (terrain and oceans). Pressure (p), mass (m), and the acceleration due to gravity (g), are related by P = F/A = (m*g)/A, where A is surface area. [14] Because of this, the boiling point of water is lower at lower pressure and higher at higher pressure.

[9], 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.



c This method became and continues to be useful for survey work and map making.

She has taught science courses at the high school, college, and graduate levels. The standard atmosphere (symbol: atm) is a unit of pressure equal to 101325 Pa ('pascals') or 1013.25 millibars or hectopascals.

Click "Create Table". [5] However, in Canada's public weather reports, sea level pressure is instead reported in kilopascals.[6]. ⋅ 1 psi = 0.0680459637 atm.

1 atmosphere = 2116.2166236739 pounds per square foot. T 0 1 Psi (pound force per square inch) is equal to 0.06804596379 atm.

Air pressure above sea level can be calculated as. This tool converts atmospheres to pounds per square foot (atm to psf) and vice versa. [10] The discrimination is due to the problematic assumptions (assuming a standard lapse rate) associated with reduction of sea level from high elevations. 0

What Is The Speed Of Light In Miles Per Hour? Dr. Helmenstine holds a Ph.D. in biomedical sciences and is a science writer, educator, and consultant. ⋅ − How to convert psi to atm (atmospheric pressure)? This is the atmospheric pressure normally given in weather reports on radio, television, and newspapers or on the Internet. g


1) Enter a valid Start value into text box below, default is "1". 1 Psi (pound force per square inch) is equal to 0.06804596379 atm. c

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 of mercury (to two decimal places). (3487 Pa or 34.9 millibars).

pressure in psi = (pressure in atm) x (14.696 psi/1 atm)pressure in psi = (99.136 x 14.696) psipressure in psi = 1456.9 psi.

A column of air with a cross-sectional area of 1 in2 would have a weight of about 14.7 lbf, resulting in a pressure of 14.7 lbf/in2.

This effect is strongest in tropical zones, with an amplitude of a few millibars, and almost zero in polar areas. ⋅ = p

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