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The pascal (symbol: Pa) is the SI derived unit of pressure or stress (also: Young's modulus and tensile strength). It is a measure of perpendicular force per unit area i.e. equivalent to one newton per square meter or one Joule per cubic meter. In everyday life, the pascal is perhaps best known from meteorological air-pressure reports, where it occurs in the form of hectopascal (1 hPa = 100 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). The pascal (symbol: Pa) is the SI unit of pressure. ...
SI derived units are part of the SI system of measurement units and are derived from the seven SI base units. ...
This article is about pressure in the physical sciences. ...
Stress is a measure of force per unit area within a body. ...
In solid mechanics, Youngs modulus (E) is a measure of the stiffness of a given material. ...
Tensile strength isthe measures the force required to pull something such as rope, wire, or a structural beam to the point where it breaks. ...
For other uses, see Force (disambiguation). ...
This article is about the physical quantity. ...
For other uses, see Newton (disambiguation). ...
A square metre (US spelling: square meter) is by definition the area enclosed by a square with sides each 1 metre long. ...
Diurnal (daily) rhythm of air pressure in northern Germany (black curve is air pressure) Atmospheric pressure is the pressure at any point in the Earths atmosphere. ...
Definition - 1 pascal (Pa) ≡ 1 N·m−2 ≡ 1 J·m−3 ≡ 1 kg·m−1·s−2
Pressure Units | |
pascal
(Pa) |
bar
(bar) | technical atmosphere
(at) |
atmosphere
(atm) |
torr
(Torr) | pound-force per
square inch
(psi) | | 1 Pa | ≡ 1 N/m2 | 10−5 | 1.0197×10−5 | 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 | 0.96784 | 735.56 | 14.223 | | 1 atm | 101,325 | 1.01325 | 1.0332 | ≡ 1 atm | 760 | 14.696 | | 1 torr | 133.322 | 1.3332×10−3 | 1.3595×10−3 | 1.3158×10−3 | ≡ 1 Torr; ≈ 1 mmHg | 19.337×10−3 | | 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 = 10.197×10−6 at = 9.8692×10−6 atm, etc.
Note: mmHg is an abbreviation for millimetres of mercury. For other uses, see Newton (disambiguation). ...
This article is about the unit of length. ...
The joule (IPA: or ) (symbol: J) is the SI unit of energy. ...
This article is about the unit of length. ...
“Kg†redirects here. ...
This article is about the unit of length. ...
This article is about the unit of time. ...
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 1 kilogram-force per square centimeter, i. ...
Standard atmosphere (symbol: atm) is a unit of pressure. ...
The torr (symbol: Torr) or millimeter of mercury (mmHg) is a non-SI unit of pressure. ...
A pressure gauge reading in PSI (red scale) and kPa (black scale) The pound-force per square inch (symbol: lbf/in²) is a non-SI unit of pressure based on avoirdupois units. ...
For other uses, see Newton (disambiguation). ...
In physics, the dyne is a unit of force specified in the centimetre-gram-second (cgs) system of units, symbol dyn. One dyne is equal to exactly 10-5 newtons. ...
The deprecated unit kilogram-force (kgf) or kilopond (kp) is the force exerted by one kilogram of mass in standard Earth gravity (defined as exactly 9. ...
Standard atmosphere (symbol: atm) is a unit of pressure. ...
The torr (symbol: Torr) or millimeter of mercury (mmHg) is a non-SI unit of pressure. ...
The pound-force is a non-SI unit of force or weight (properly abbreviated lbf or lbf). The pound-force is equal to a mass of one pound multiplied by the standard acceleration due to gravity on Earth (which is defined as exactly 9. ...
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. The name pascal was adopted for the SI unit newton per square metre by the 14th CGPM in 1971. [1] Blaise Pascal (pronounced ), (June 19, 1623 – August 19, 1662) was a French mathematician, physicist, and religious philosopher. ...
Leonhard Euler, considered one of the greatest mathematicians of all time A mathematician is a person whose primary area of study and research is the field of mathematics. ...
Not to be confused with physician, a person who practices medicine. ...
A philosopher is a person who thinks deeply regarding people, society, the world, and/or the universe. ...
A barometer is an instrument used to measure atmospheric pressure. ...
For other uses, see Newton (disambiguation). ...
A square metre (US spelling: square meter) is by definition the area enclosed by a square with sides each 1 metre long. ...
The Conférence générale des poids et mesures (General Conference on Weights and Measures or CGPM) is one of the three organizations established to maintain the SI system under the terms of the Metre Convention (1875). ...
| This SI unit is named after Blaise Pascal. As for all SI units whose names are derived from the proper name of a person, the first letter of its symbol is uppercase (Pa). But when an SI unit is spelled out, it should always be written in lowercase (pascal), unless it begins a sentence or is the name "degree Celsius". | Look up si, Si, SI in Wiktionary, the free dictionary. ...
Blaise Pascal (pronounced ), (June 19, 1623 – August 19, 1662) was a French mathematician, physicist, and religious philosopher. ...
Majuscules or capital letters (in the Roman alphabet: A, B, C, ...) are one type of case in a writing system. ...
Minuscule, or lower case, is the smaller form (case) of letters (in the Roman alphabet: a, b, c, ...). Originally alphabets were written entirely in majuscule (capital) letters which were spaced between well-defined upper and lower bounds. ...
Celsius is, or relates to, the Celsius temperature scale (previously known as the centigrade scale). ...
Miscellany Standard atmospheric pressure is 101,325 Pa = 101.325 kPa = 1013.25 hPa = 1013.25 mbar = 760 Torr. This definition is used for pneumatic fluid power (ISO R554), and in the aerospace (ISO 2533) and petroleum (ISO 5024) industries. A millibar (mbar, also mb) is 1/1000th of a bar, a unit for measurement of pressure. ...
The torr (symbol: Torr) or millimeter of mercury (mmHg) is a non-SI unit of pressure. ...
In 1985, IUPAC recommended that standard atmospheric pressure should be harmonized to 100,000 Pa = 1 bar = 750 Torr. The same definition is used in the compressor and the pneumatic tool industries (ISO 2787).[3] The International Union of Pure and Applied Chemistry (IUPAC) is an international non-governmental organization devoted to the advancement of chemistry. ...
The bar (symbol bar), decibar (symbol dbar) and the millibar (symbol mbar, also mb) are units of pressure. ...
The torr (symbol: Torr) or millimeter of mercury (mmHg) is a non-SI unit of pressure. ...
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. The Unicode Standard, Version 5. ...
The Unicode Standard, Version 5. ...
The Unicode Standard, Version 5. ...
In computer software standards and documentation, deprecation is the gradual phasing-out of a software or programming language feature. ...
Uses Meteorologists worldwide have for a long time measured atmospheric pressure in millibars. 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. Meteorology is the scientific study of the atmosphere that focuses on weather processes and forecasting. ...
Metrication or metrification refers to the introduction of the SI metric system as the international standard for physical measurements—a long-term series of independent and systematic conversions from the various separate local systems of weights and measures. ...
- 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 introduced in the Soviet Union in 1933, but abolished in 1955. ...
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. This article or section is in need of attention from an expert on the subject. ...
The barye (symbol: Ba) is the centimetre-gram-second (CGS) unit of pressure. ...
Vehicle owners' guides now specify tire inflation in kilopascals. Firestone tire This article is about pneumatic tires. ...
See also 1 At earth mean sea level. ...
References ISO 5775 is an international standard for labeling the size of bicycle tyres and rims. ...
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