- See also: Pascal's law
The pascal (symbol: Pa) is the SI derived unit of pressure or stress (also: Young's modulus and tensile strength). SI derived units are part of the SI system of measurement units and are derived from the seven SI base units They are derived from SI basic units/defined Pressure (symbol 'p' is the force per unit Area applied to an object in a direction perpendicular to the surface Stress is a measure of the average amount of Force exerted per unit Area. In Solid mechanics, Young's modulus (E is a measure of the Stiffness of an isotropic elastic material Tensile strength \sigma_{UTS} or S_U is the Stress at which a material breaks or permanently deforms It is a measure of perpendicular force per unit area i. In Physics, a force is whatever can cause an object with Mass to Accelerate. Area is a Quantity expressing the two- Dimensional size of a defined part of a Surface, typically a region bounded by a closed Curve. e. equivalent to one newton per square meter or one joule per cubic meter. The newton (symbol N) is the SI derived unit of Force, named after Isaac Newton in recognition of his work on Classical M^2 redirects here For other uses see M². CM2 redirects here The joule (written in lower case ˈdʒuːl or /ˈdʒaʊl/ (symbol J) is the SI unit of Energy measuring heat, Electricity In everyday life, the pascal is perhaps best known from meteorological air-pressure reports, where it occurs in the form of kilopascal (1 kPa = 1000 Pa). [1] In other contexts, the kilopascal is more commonly used, for example on bicycle tire labels. [2] One hectopascal corresponds to about 0. 1% and one kilopascal to about 1% of atmospheric pressure (near sea level): one hectopascal is thus equivalent to a millibar. The bar (symbol bar) decibar (symbol dbar) and the millibar (symbol mbar, also mb are units of Pressure. One Newton is just under a quarter-pound of force; 1 N = 0. 22481 lbf.
Contents |
Definition
pascal (Pa) |
bar (bar) |
technical atmosphere (at) |
atmosphere (atm) |
torr (Torr) |
pound-force per square inch (psi) |
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|---|---|---|---|---|---|---|
| 1 Pa | ≡ 1 N/m2 | 10−5 | 1. The newton (symbol N) is the SI derived unit of Force, named after Isaac Newton in recognition of his work on Classical The metre or meter is a unit of Length. It is the basic unit of Length in the Metric system and in the International The joule (written in lower case ˈdʒuːl or /ˈdʒaʊl/ (symbol J) is the SI unit of Energy measuring heat, Electricity The metre or meter is a unit of Length. It is the basic unit of Length in the Metric system and in the International The metre or meter is a unit of Length. It is the basic unit of Length in the Metric system and in the International The second ( SI symbol s) sometimes abbreviated sec, is the name of a unit of Time, and is the International System of Units The bar (symbol bar) decibar (symbol dbar) and the millibar (symbol mbar, also mb are units of Pressure. A technical atmosphere (symbol at is a non- SI unit of Pressure equal to one Kilogram-force per square centimeter The Standard atmosphere is an international reference pressure defined as 101325 Pa and formerly used as unit of Pressure (symbol atm The torr (symbol Torr) is a non- SI unit of Pressure defined as 1/760 of an atmosphere. The pound per square inch or more accurately pound-force per square inch (symbol psi or lbf/in² or lbf/in²) is a unit of The newton (symbol N) is the SI derived unit of Force, named after Isaac Newton in recognition of his work on Classical 0197×10−5 | 9. 8692×10−6 | 7. 5006×10−3 | 145. 04×10−6 |
| 1 bar | 100,000 | ≡ 106 dyn/cm2 | 1. 0197 | 0. 98692 | 750. 06 | 14. 504 |
| 1 at | 98,066. 5 | 0. 980665 | ≡ 1 kgf/cm2 | 0. The unit kilogram-force ( kgf, often incorrectly just kg) or kilopond ( kp) is defined as the Force exerted by Earth's gravity 96784 | 735. 56 | 14. 223 |
| 1 atm | 101,325 | 1. 01325 | 1. 0332 | ≡ 1 atm | 760 | 14. The Standard atmosphere is an international reference pressure defined as 101325 Pa and formerly used as unit of Pressure (symbol atm 696 |
| 1 torr | 133. 322 | 1. 3332×10−3 | 1. 3595×10−3 | 1. 3158×10−3 | ≡ 1 Torr; ≈ 1 mmHg | 19. The torr (symbol Torr) is a non- SI unit of Pressure defined as 1/760 of an atmosphere. 337×10−3 |
| 1 psi | 6,894. 76 | 68. 948×10−3 | 70. 307×10−3 | 68. 046×10−3 | 51. 715 | ≡ 1 lbf/in2 |
Example reading: 1 Pa = 1 N/m2 = 10−5 bar = 10. This article deals with the unit of force For the unit of mass see Pound (mass. 197×10−6 at = 9. 8692×10−6 atm, etc.
Note: mmHg is an abbreviation for millimetres of mercury.
Origin
The unit is named after Blaise Pascal, the eminent French mathematician, physicist, and philosopher noted for his experiments with a barometer, an instrument to measure air pressure. Blaise Pascal (blɛz paskal (June 19 1623 &ndash August 19 1662 was a French Mathematician, Physicist, and religious Philosopher This article is about the country For a topic outline on this subject see List of basic France topics. A mathematician is a person whose primary area of study and research is the field of Mathematics. A physicist is a Scientist who studies or practices Physics. Physicists study a wide range of physical phenomena in many branches of physics spanning Philosophy is the study of general problems concerning matters such as existence knowledge truth beauty justice validity mind and language History The first barometer is thought to have been built unintentionally by Gasparo Berti, sometime between 1640 and 1643 The name pascal was adopted for the SI unit newton per square metre by the 14th CGPM in 1971. The newton (symbol N) is the SI derived unit of Force, named after Isaac Newton in recognition of his work on Classical M^2 redirects here For other uses see M². CM2 redirects here The General Conference on Weights and Measures is the English name of the Conférence générale des poids et mesures ( CGPM, never GCWM [1]
| This SI unit is named after Blaise Pascal. Blaise Pascal (blɛz paskal (June 19 1623 &ndash August 19 1662 was a French Mathematician, Physicist, and religious Philosopher As with every SI unit whose name is derived from the proper name of a person, the first letter of its symbol is uppercase (Pa). The musical instrument is spelled Cymbal. A symbol is something --- such as an object, Picture, written word a sound a piece Capital letters or majuscules pronunciation /məˈdʒʌskyuls ˈmædʒəˌskyuls/ in the Roman alphabet A, B, C, D, When an SI unit is spelled out in English, it should always begin with a lowercase letter (pascal), except where any word would be capitalized, such as at the beginning of a sentence or in capitalized material such as a title. Lower case (also lower-case or lowercase) minuscule, or small letters are the smaller form of letters as opposed to upper Note that "degree Celsius" conforms to this rule because the "d" is lowercase. The Celsius Temperature scale was previously known as the centigrade scale.
— Based on The International System of Units, section 5. 2.
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Miscellaneous
Standard atmospheric pressure is 101,325 Pa = 101. 325 kPa = 1013. 25 hPa = 1013. 25 mbar = 760 Torr. The bar (symbol bar) decibar (symbol dbar) and the millibar (symbol mbar, also mb are units of Pressure. The torr (symbol Torr) is a non- SI unit of Pressure defined as 1/760 of an atmosphere. This definition is used for pneumatic fluid power (ISO R554), and in the aerospace (ISO 2533) and petroleum (ISO 5024) industries.
In 1985, IUPAC recommended that standard atmospheric pressure should be harmonized to 100,000 Pa = 1 bar = 750 Torr. The International Union of Pure and Applied Chemistry ( IUPAC) (aɪjuːpæk or ay-yoo-pec) is an international Non-governmental organization The bar (symbol bar) decibar (symbol dbar) and the millibar (symbol mbar, also mb are units of Pressure. The torr (symbol Torr) is a non- SI unit of Pressure defined as 1/760 of an atmosphere. The same definition is used in the compressor and the pneumatic tool industries (ISO 2787). [3]
The Unicode computer character set has dedicated symbols ㎩ (U+33A9) for Pa and ㎪ (U+33AA) for kPa, but these exist merely for backward-compatibility with some older ideographic character-sets and are therefore deprecated. In Computing, Unicode is an Industry standard allowing Computers to consistently represent and manipulate text expressed in most of the world's In Computing, Unicode is an Industry standard allowing Computers to consistently represent and manipulate text expressed in most of the world's In Computing, Unicode is an Industry standard allowing Computers to consistently represent and manipulate text expressed in most of the world's In Computer software standards and documentation the term deprecation is applied to Software features that are superseded and should be avoided
Uses
Meteorologists worldwide have for a long time measured atmospheric pressure in millibars. Meteorology (from Greek grc μετέωρος metéōros, "high in the sky" and grc -λογία -logia) is the Interdisciplinary After the introduction of SI units, many preferred to preserve the customary pressure figures. Therefore, meteorologists use hectopascals (hPa) today for air pressure, which are equivalent to millibars, while similar pressures are given in kilopascals in practically all other fields, where the hecto prefix is hardly ever used. Since official metrication, meteorologists in Canada use kilopascals (kPa), see for example CTV News, weather; current conditions in Montréal and CBC weather, current conditions in Montréal, although in some other countries hectopascals are still in use, see for example KNMI, KMI, DWD, JMA, MDD and NOAA. Metrication (or metrification refers to the introduction of the SI metric system as the International standard for physical measurements—a long-term series
- 1 hectopascal (hPa) ≡ 100 Pa ≡ 1 mbar.
- 1 kilopascal (kPa) ≡ 1000 Pa ≡ 10 hPa.
In the former mts system, the unit of pressure is the pièze (symbol pz), which is equal to one kilopascal. The metre-tonne-second or mts system of units is a system of Physical units It was invented in France hence the unit names sthène and pièze The pieze is the unit of pressure in the Metre-tonne-second system of units (mts system used e
In the former cgs system, the unit of pressure is the barye (symbol ba), which is equal to one decipascal. The centimetre-gram-second system ( CGS) is a system of physical units. The barye (symbol Ba) was in France a centimetre-gram-second (CGS unit of Pressure.
Vehicle owners' guides now specify tire inflation in kilopascals. This article is about tires used on road Vehicles including pneumatic tires and solid tires.
Airtightness testing of buildings is measured at 50 Pa or 0. Minneapolis Blower Doorjpg|thumb|right]]A blower door is a Diagnostic tool designed to measure the Airtightness of Buildings and to help locate air 2 inches of water.
See also
References
- ^ Environment Canada: Example of a weather report, Pressure/Tendency = (example) 101. Pascal (unitIn the Physical sciences, Pascal's law or Pascal's principle states that "a change in the pressure of an enclosed incompressible fluid is conveyed Citations 7kPa rising"
- ^ ISO 5775: Bicycle tires and rims
- ^ http://www.compressor.co.za/news/may%20news.htm. ISO 5775 is an international standard for labeling the size of Bicycle tires and rims.
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