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pressure differential

Comprehensive Analysis

1) "Pressure" -- As to pressure differential 1pres·sure Pronunciation: 'pre-sh&r Function: noun Etymology: Middle English, from Anglo-French, from Late Latin pressura, from Latin, action of pressing, pressure, from pressus, past participle of premere 1 a : the burden of physical or mental distress b : the constraint of circumstance : the weight of social or economic imposition 2 : the application of force to something by something else in direct contact with it : COMPRESSION 3 archaic : IMPRESSION, STAMP 4 a : the action of a force against an opposing force b : the force or thrust exerted over a surface divided by its area c : ELECTROMOTIVE FORCE 5 : the stress or urgency of matters demanding attention : EXIGENCY <people who work well under pressure> 6 : the force of selection that results from one or more agents and tends to reduce a population of organisms <population pressure> <predation pressure> 7 : the pressure exerted in every direction by the weight of the atmosphere 8 : a sensation aroused by moderate compression of a body part or surface - pres·sure·less adjective Pronunciation Symbols The use of water pressure - the Captain Cook Memorial Jet in Lake Burley Griffin, Canberra. Pressure (symbol: p) is the force per unit area applied on a surface in a direction perpendicular to that surface. Mathematically: where: p is the pressure F is the normal force A is the area. Pressure is a scalar, and has SI units of pascals, 1 Pa = 1 N/m2. Pressure is transmitted to solid boundaries or across arbitrary sections of fluid normal to these boundaries or sections at every point. It is a fundamental parameter in thermodynamics and it is conjugate to volume. Conjugate variables of thermodynamics Pressure Volume (Stress) (Strain) Temperature Entropy Chem. potential Particle no. 1 History 2 Example 3 Scalar nature of pressure 4 Negative pressures 5 Hydrostatic pressure (head pressure) 6 Stagnation pressure 7 Surface pressure 8 See also 9 Notes 10 External links As an example of varying pressures, a finger can be pressed against a wall without making any lasting impression; however, the same finger pushing a thumbtack can easily damage the wall. Although the force applied to the surface is the same, the thumbtack applies more pressure because the point concentrates that force into a smaller area. Pressure is transmitted to solid boundaries or across arbitrary sections of fluid nor..." 2) "Differential" -- As to pressure differential 1dif·fer·en·tial Pronunciation: "di-f&-'ren(t)-sh&l Function: adjective 1 a : of, relating to, or constituting a difference : DISTINGUISHING b : making a distinction between individuals or classes c : based on or resulting from a differential d : functioning or proceeding differently or at a different rate 2 : being, relating to, or involving a differential or differentiation 3 a : relating to quantitative differences b : producing effects by reason of quantitative differences - dif·fer·en·tial·ly /-'ren(t)-sh&-lE/ adverb Pronunciation Symbols Differential may refer to: Differential (calculus), multiple related meanings in calculus and differential geometry, such as an infinitesimal change in the value of a function Differential (coboundary), in homological algebra and algebraic topology, one of the maps of a cochain complex Differential (cryptography), in differential cryptanalysis, a pair consisting of the difference, usually computed by XOR (exclusive or), between two plaintexts, and the difference of the corresponding ciphertexts Differential (mechanical device), a gear or similar device for allowing each of the driving wheels to rotate at different speeds Semantic and structural differentials in psychology A quality spread differential in economics The result of a medical test using differential staining, such as the white blood cell differential The word differential is also used in many fields as an adjective to refer to differences, particularly those of a variable or continuous nature. Examples include differential hardening in metallurgy, differential rotation in astronomy, differential centrifugation in cell biology, differential scanning calorimetry in materials science, differential signalling in communications, differential diagnosis in medicine, differential algebra in mathematics, differential execution in computer science, and differential GPS technology. ..." 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