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Poise (unit) The poise (symbol P; /pɔɪz, pwɑːz/) is the unit of dynamic viscosity (absolute viscosity) in the centimetre–gram–second system of units.[1] It is named after Jean Léonard Marie Poiseuille (see Hagen– Poiseuille equation). 1 P = 0.1 kg ⋅ m − 1 ⋅ s − 1 = 1 g ⋅ cm − 1 ⋅ s − 1 = 1 dyne & [...More...] 


Hagen–Poiseuille Equation In nonideal fluid dynamics, the Hagen–Poiseuille equation, also known as the Hagen–Poiseuille law, Poiseuille law or Poiseuille equation, is a physical law that gives the pressure drop in an incompressible and Newtonian fluid in laminar flow flowing through a long cylindrical pipe of constant cross section. It can be successfully applied to air flow in lung alveoli, or the flow through a drinking straw or through a hypodermic needle. It was experimentally derived independently by Jean Léonard Marie Poiseuille Jean Léonard Marie Poiseuille in 1838[1] and Gotthilf Heinrich Ludwig Hagen,[2] and published by Poiseuille in 1840–41 and 1846.[1] The assumptions of the equation are that the fluid is incompressible and Newtonian; the flow is laminar through a pipe of constant circular crosssection that is substantially longer than its diameter; and there is no acceleration of fluid in the pipe [...More...] 


Metric Prefix A metric prefix is a unit prefix that precedes a basic unit of measure to indicate a multiple or fraction of the unit. While all metric prefixes in common use today are decadic, historically there have been a number of binary metric prefixes as well.[1] Each prefix has a unique symbol that is prepended to the unit symbol. The prefix kilo, for example, may be added to gram to indicate multiplication by one thousand: one kilogram is equal to one thousand grams. The prefix milli, likewise, may be added to metre to indicate division by one thousand; one millimetre is equal to one thousandth of a metre. Decimal Decimal multiplicative prefixes have been a feature of all forms of the metric system, with six dating back to the system's introduction in the 1790s. Metric prefixes have even been prepended to nonmetric units [...More...] 


Standard Conditions For Temperature And Pressure Standard conditions for temperature and pressure are standard sets of conditions for experimental measurements to be established to allow comparisons to be made between different sets of data. The most used standards are those of the International Union of Pure and Applied Chemistry (IUPAC) and the National Institute of Standards and Technology (NIST), although these are not universally accepted standards [...More...] 


Atmosphere (unit) The standard atmosphere (symbol: atm) is a unit of pressure defined as 101325 Pa (1.01325 bar). It is sometimes used as a reference or standard pressure.Contents1 History 2 Pressure Pressure units and equivalencies 3 Other applications 4 See also 5 ReferencesHistory[edit] It was originally defined as the pressure exerted by 760 mm of mercury at 0 °C and standard gravity (g = 9.80665 m/s2).[1] It was used as a reference condition for physical and chemical properties, and was implicit in the definition of the Centigrade (later Celsius) scale of temperature by defining 100 °C as being the boiling point of water at this pressure [...More...] 


International Standard Book Number The International Standard Book Book Number (ISBN) is a numeric commercial book identifier which is intended to be unique.[a][b] Publishers purchase ISBNs from an affiliate of the International ISBN Agency.[1] An ISBN is assigned to each separate edition and variation (except reprintings) of a publication. For example, an ebook, a paperback and a hardcover edition of the same book will each have a different ISBN. The ISBN is ten digits long if assigned before 2007, and thirteen digits long if assigned on or after 1 January 2007. The method of assigning an ISBN is nationspecific and varies between countries, often depending on how large the publishing industry is within a country. The initial ISBN identification format was devised in 1967, based upon the 9digit Standard Book Book Numbering (SBN) created in 1966 [...More...] 


Special Special Special or the specials or variation, may refer to:.mwparseroutput .tocright float:right;clear:right;width:auto;background:none;padding:.5em 0 .8em 1.4em;marginbottom:.5em .mwparseroutput .tocrightclearleft clear:left .mwparseroutput .tocrightclearboth clear:both .mwparseroutput .tocrightclearnone clear:none Contents1 Policing 2 Literature 3 Film and television 4 Music4.1 Albums 4.2 Songs5 Computing 6 Other uses 7 See alsoPolicing[edit] Specials, Ulster [...More...] 


Centimetre–gram–second System Of Units The centimetre–gram–second system of units (abbreviated CGS or cgs) is a variant of the metric system based on the centimetre as the unit of length, the gram as the unit of mass, and the second as the unit of time. All CGS mechanical units are unambiguously derived from these three base units, but there are several different ways of extending the CGS system to cover electromagnetism.[1][2] The CGS system has been largely supplanted by the MKS system based on the metre, kilogram, and second, which was in turn extended and replaced by the International System of Units International System of Units (SI) [...More...] 


Jean Léonard Marie Poiseuille Jean Léonard Marie Poiseuille[a] (French: [pwazœj]; 22 April 1797[1] – 26 December 1869) was a French physicist and physiologist. Poiseuille was born in Paris, France, and he died there on 26 December 1869.Contents1 Fluid flow 2 Notes 3 References 4 Further readingFluid flow[edit] From 1815 to 1816 he studied at the École Polytechnique École Polytechnique in Paris. He was trained in physics and mathematics. In 1828 he earned his D.Sc. degree with a dissertation entitled Recherches sur la force du coeur aortique [...More...] 


Pascalsecond The viscosity of a fluid is a measure of its resistance to gradual deformation by shear stress or tensile stress.[1] For liquids, it corresponds to the informal concept of "thickness"; for example, honey has higher viscosity than water.[2] Viscosity Viscosity is a property of the fluid which opposes the relative motion between the two surfaces of the fluid that are moving at different velocities. In simple terms, viscosity means friction between the molecules of fluid. When the fluid is forced through a tube, the particles which compose the fluid generally move more quickly near the tube's axis and more slowly near its walls; therefore some stress (such as a pressure difference between the two ends of the tube) is needed to overcome the friction between particle layers to keep the fluid moving [...More...] 


Poiseuille The poiseuille (symbol Pl) has been proposed as a derived SI unit of dynamic viscosity,[1] named after the French physicist Jean Léonard Marie Poiseuille (1797–1869). In practice the unit has never been widely accepted and most international standards bodies do not include the poiseuille in their list of units [...More...] 


Viscosity The viscosity of a fluid is a measure of its resistance to gradual deformation by shear stress or tensile stress.[1] For liquids, it corresponds to the informal concept of "thickness"; for example, honey has higher viscosity than water.[2] Viscosity Viscosity is a property of the fluid which opposes the relative motion between the two surfaces of the fluid that are moving at different velocities. In simple terms, viscosity means friction between the molecules of fluid. When the fluid is forced through a tube, the particles which compose the fluid generally move more quickly near the tube's axis and more slowly near its walls; therefore some stress (such as a pressure difference between the two ends of the tube) is needed to overcome the friction between particle layers to keep the fluid moving [...More...] 


SI The International System of Units International System of Units (SI, abbreviated from the French Système international (d'unités)) is the modern form of the metric system, and is the most widely used system of measurement. It comprises a coherent system of units of measurement built on seven base units (ampere, kelvin, second, metre, kilogram, candela, mole) and a set of twenty decimal prefixes to the unit names and unit symbols that may be used when specifying multiples and fractions of the units. The system also specifies names for 22 derived units for other common physical quantities like lumen, watt, etc. The base units, except for one, are derived from invariant constants of nature, such as the speed of light and the triple point of water, which can be observed and measured with great accuracy [...More...] 


Poise (unit) The poise (symbol P; /pɔɪz, pwɑːz/) is the unit of dynamic viscosity (absolute viscosity) in the centimetre–gram–second system of units.[1] It is named after Jean Léonard Marie Poiseuille (see Hagen– Poiseuille equation). 1 P = 0.1 kg ⋅ m − 1 ⋅ s − 1 = 1 g ⋅ cm − 1 ⋅ s − 1 = 1 dyne & [...More...] 
