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# Topic: Physical quantities

 Encyclopedia: Physical quantity   (Site not responding. Last check: 2007-11-07) P represents the physical quantity of power Mechanical power In physics, power (symbol: P) is the amount of work W done per unit of time t. In physics and chemistry, an extensive quantity (also referred to as an extensive variable) is a physical quantity whose value is proportional to the size of the system it describes. In physics and chemistry, an intensive quantity (also referred to as an intensive variable) is a physical quantity whose value does not depend on the amount of the substance for which it is measured. www.nationmaster.com /encyclopedia/Physical-quantity   (657 words)

 20th WCP: Philosophy of Contents: Form and Coulomb's Law A transformation of the dimensionalities of physical quantities, for both electric as well as magnetic fields with fractional powers of CGS units (that are the basis for SI units) into dimensionalities with integer powers of the units, gets at present exclusively important meaning, especially, after the disaster happened at Chernobyl's atomic station. Physical quantities of the same absolute dimensionality of the GCS-system express the different manifestation of the same property of a multiface process or an object of study. Physical quantities belonging to the classes with the unit argument of contents D(1, l, m) form a set of dynamic physical quantities or, simply, the dynamic set. www.bu.edu /wcp/Papers/Scie/ScieShpe.htm   (2817 words)

 PHYSICAL UNITS - LoveToKnow Article on PHYSICAL UNITS   (Site not responding. Last check: 2007-11-07) These quantities are extremely small, and admit of correct determination to about one part in ten-thousand, and range, in the visible spectrum, from about 6 to 4 ten-millionths of a metre. A correlation of these units of quantity of heat with the fundamental units of mass, length and time attended the recognition of the fact that heat was a form of energy; and their quantitative relationships followed from the experimental determinations of the so-called " mechanical equivalent of heat," i.e. The important quantity in connection with polar magnets is not a mechanical stress between the free poles of different magnets, but the magnetic flux emanating from, or associating with, them. 78.1911encyclopedia.org /U/UN/UNITS_PHYSICAL.htm   (8315 words)

 Physical quantity - Encyclopedia.WorldSearch   (Site not responding. Last check: 2007-11-07) A physical quantity is either a quantity within physics that can be measured (e.g. If these sub- or superscripts are themselves symbols for physical quantities or numbers, they are printed in italic. Effects of a curriculum and inservice program on the quantity and quality of elementary physical education classes. encyclopedia.worldsearch.com /physical_quantity.htm   (294 words)

 Ontolingua Theory PHYSICAL-QUANTITIES In engineering analysis, physical quantities such as the length of a beam or the velocity of a body are routinely modeled by variables in equations with numbers as values. Physical quantities of the type function-quantity are functions that map quantities to other quantities (e.g., time-dependent quantities are function-quantities). A physical dimension is a property we associate with physical quantities for purposes of classification or differentiation. www-ksl.stanford.edu /htw/dme/thermal-kb-tour/physical-quantities.html   (2564 words)

 International Journal of Electrical Engineering Education: Electrodynamics in formulae Physical quantities are experimentally detected or analytically defined in the process of building a physical theory: macroscopic or microscopic, classical or quantum, relativistic or non-relativistic. Physical quantities which are necessary and sufficient to state the general laws are called primary quantities, while the other ones will be called derived quantities. The physical quantities, for which independent units of measure are chosen, are called fundamental quantities of the system of units of measure, while the others are called secondary quantities. www.findarticles.com /p/articles/mi_qa3792/is_199707/ai_n8759483   (1242 words)

 Units and Dimensionality All physical quantities have a fundamental dimension that is independent of the units of measurement. Physical quantities with the same dimension in different systems of units can be added or subtracted by multiplying one of the quantities by a units conversion factor to obtain compatible units. The division of one physical quantity by another results in a new physical quantity that has the dimension of the exponents of the first quantity minus the exponents of the second quantity. www.csee.umbc.edu /help/theory/units.shtml   (2128 words)

 Physical quantity - Wikipedia, the free encyclopedia Usually, the symbols for physical quantities are chosen to be a single letter of the Latin or Greek alphabet, and are printed in italic. Often, the symbols are modified by subscripts or superscripts. If these sub- or superscripts are themselves symbols for physical quantities or numbers, they are also printed in italic. en.wikipedia.org /wiki/Physical_quantity   (244 words)

 Dimensions   (Site not responding. Last check: 2007-11-07) The dimensions of a physical quantity refer to the type of units that must be used in order to obtain the measure of that quantity. Examining the dimensions of physical quantities is useful because it enables one to check whether equations are incorrect. The measure of a physical quantity is a number equal to the physical quantity divided by the unit. www.physchem.co.za /Basic%20Skills/Dimensions.htm   (302 words)

 [No title]   (Site not responding. Last check: 2007-11-07) A physical relation between only the given physical quantities must be expressible as a relation between the nondimensional quantities. There are usually fewer nondimensional than physical quantities, which reduces the number of experiments or numerical computations necessary to establish the physical relation to a specified resolution, in comparison with the number if all but one dependent physical variable were independently varied. Also, the absence of any given physical quantity in the output reveals that either the quantity is irrelevant or others are necessary to describe the relation. starship.python.net /crew/mike/maxima/html/macref/share1/dimen.usg   (309 words)

 Units and Dimensions: Measurements: Plus 2 Physics   (Site not responding. Last check: 2007-11-07) The value n is therefore a ratio between the size of the quantity and the size of the unit for that quantity. The fundamental quantities are length, mass, time, temperature, electric current, quantity of substance, solid angle, luminous flux etc. Their units are the fundamental units. The DIMENSIONS of a physical quantity are the powers to which the fundamental quantities are raised to define the derived quantity. www.plus2physics.com /measurements/study_material.asp   (452 words)

 Physical quantities   (Site not responding. Last check: 2007-11-07) A physical quantity is expressed as a number times a unit; this may be expressed as: where a is the physical quantity, {a} is the numerical value only, and [a] is the unit only. Symbols for units of physical quantities should be printed in roman (upright) type. web.mit.edu /course/3/3.091/www/uc/node2.html   (296 words)

 RDF vocabulary for physical properties, quantities and units   (Site not responding. Last check: 2007-11-07) The relationship between a physical object and a physical quantity value is the evaluation of a physical property for that physical object. If this physical object is a state, such as 'my widget at 10:30 on 2002-03-15', then the physical property 'mass' is equivalent to a classification of the state by a member of the physical quantity space. A compound physical quantity is identified with respect to a compound scale by a vector of numeric or text values. www.scadaonweb.com /publications/units/2/NOTE-units-2002-05-07.html   (3933 words)

 Fundamental Quantum Cosmological Units This cosmic variation of the physical basic unit for mass has very interesting consequences for the physical quantities we have defined in order to describe the Universe, of which we are ourselves a part. All physical quantities, such as velocity, acceleration, force, work, energy etc. are defined as usual, but we must take in account the quantization of space, time and mass. Processes in a physical system we can describe by changes of certain quantum numbers, belonging to certain physical quantities, and for these quantum numbers certain conservation laws are valid. louis.rostra.dk /quant_05.html   (3454 words)

 Dr. Kromm's Patented Math and Physics Tutorial Measured physical quantities are always given to a certain number of decimal places; the number of places is indicative of how precise the measurement is. For instance, an automobile manufacturer might give the top speed of a car as "127 mph," meaning the speed is known to a precision of three places. Remember: whenever you state a physical quantity using decimal notation, especially one you have taken from a scientific handbook, the last digit is implicitly doubtful. A measurement is a numerical rating of a property of a physical system: the height and weight of a character, the speed and acceleration of a vehicle, the energy contained in an ultra-tech power cell, etc. A measurement always consists of two parts: a magnitude and its units. www.sjgames.com /general/guidelines/authors/math_tutorial.html   (5413 words)

 Hans Reichenbach [Internet Encyclopedia of Philosophy] Physical geometry is concerned with the real geometry, ie the geometry which is true in our physical world: it searches for the truth (or falsity) of axioms, using the methods of empirical science: experiments, measurements, etc; it is a branch of physics. On the contrary, he asserts that scientific theories are based on physical hypotheses which are not a logical consequence of experiments, eg the general theory of relativity is based on Einstein's hypothesis that free falling frames of reference are inertial systems; we cannot prove this hypothesis, but we can verify its consequences. In his opinion, modern physics is concerned with problems that, until the late 19th century, were regarded as philosophical problems, eg the nature of space and time, the source of gravitation, the real extent of causality. www.iep.utm.edu /r/reichenb.htm   (8071 words)

 Part 1   (Site not responding. Last check: 2007-11-07) A physical quantity (or physical dimension) is something that is hypothetically measurable, such as: length, time, mass, current, force, energy, power, voltage, charge or resistance. Since a physical quantity and its corresponding unit of measure must be dimensionally consistent, phrases such as "a force of 3 volts", or "50 milliamp-hours of energy" are meaningless and should be avoided. The unit of measure associated with a particular quantity may be represented by placing the quantity in square brackets, e.g. www.homefly.com /reference/part-1.htm   (633 words)

 The Extension, Age and Mass of the Universe, calculated by means of atomic physical quantities and Newton's ... I shall deduct equations allowing us to calculate cosmological quantities as the age, extension and total mass of the Universe by means of atomic physical quantities and Newton's gravitational 'constant'. Planck's Constant, the mass of an electron, its extension and electrical charge, and quantities characteristical for the Universe as a whole, such as its mass, extension and age, and furthermore the velocity of light and Newton's gravitational constant. The quantity N is not a constant, but plays a role as a cosmic evolution quantum number, which had a much smaller value when electrons were created in the young Universe. www.rostra.dk /louis/quant_11.html   (921 words)

 Teaching Ratio, Proportion and Continued-Proportion between Physical Quantities This ratio of one physical quantity to another is so fundamental and so widely accepted in modern science and also every-day life that it needs to be taught in science education. This paper analyzes the proportion between physical quantities in terms of two axioms that the quantity ratios obey; this processing bridges the gap between the two methods. Forming a ratio between physical quantities is a useful way to compare one with the other in science and technology. www.juen.ac.jp /scien/morikawa_base/ratio.html   (1829 words)

 2. KEY PHYSICAL QUANTITIES Energy causes force to be exerted and the oscillations of the particles comprising the medium are therefore transmitted from point to point in the water at a speed depending on the factors given in section 2.6.1. The logarithmic ratio between two quantities one of which is twice the size of the other could be log 2/1 or log 1/2 depending on the reference. From the example in the previous section it was shown that the logarithmic ratio between two quantities of power or intensity, one of which is twice the size of the other, is +3.010 and -3.010 depending on which is taken as the reference quantity. www.fao.org /docrep/X5818E/x5818e03.htm   (3990 words)

 Ontolingua Theory PHYSICAL-QUANTITIES Quantities are described in terms of reference quantities called units-of-measure. The physical-quantities theory defines the basic vocabulary for describing physical quantities in a general form, making explicit the relationships between magnitudes of various orders, units of measure and physical dimensions. This theory helps support the consistent use of units in expressions relating physical quantities, and it also supports conversion of units needed in calculations. www.ksl.stanford.edu /people/brauch/demo/physical-quantities   (393 words)

 Physical Quantities   (Site not responding. Last check: 2007-11-07) Visible structure used to identify or tag the physical quantity. The numerical value associated with a measurement of a physical quantity. The numerical value of some physical quantity is incomplete without a reference to the "size" of the numbers. www.ac.wwu.edu /~vawter/PhysicsNet/ProblemSolving/PhysQuantities.html   (80 words)

 [No title]   (Site not responding. Last check: 2007-11-07) A physical quantity is the result of measurement and usually expressed as the product of a numerical value and a physical unit (whereby SI units are usually preferred). A quantity is called extensive when its magnitude is additive for subsystems as there are the volume V or the mass m. The word specific is added to an extensive quantity in order to refer to the quantity divided by its mass (e.g. www.informationgenius.com /encyclopedia/p/ph/physical_quantity.html   (205 words)

 A tentative explanation of the origin of physics   (Site not responding. Last check: 2007-11-07) In physics, 'basic physical quantities' are used to express the laws legislating the Universe. The 'basic physical quantities' are physics' foundation on which all other entities and phenomenon are built upon. Time can be expressed in terms of distance and temperature, reinforcing the feeling that the seven 'basic physical quantities' might not be as basic as claimed. www.doestimeexist.info /i4_Tentative_explanation.htm   (352 words)

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