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# Topic: SI unit

###### In the News (Thu 25 Apr 19)

 SI base unit - Wikipedia, the free encyclopedia   (Site not responding. Last check: 2007-08-19) The unit of mass is equal to the mass of the international prototype kilogram (a platinum-iridium cylinder) kept at the Bureau International des Poids et Mesures (BIPM), Sèvres, Paris (1st CGPM (1889), CR 34-38). The unit of time is the duration of exactly 9 192 631 770 periods of the radiation corresponding to the transition between two hyperfine levels of the ground state of the caesium-133 atom at a temperature of 0 K (13th CGPM (1967-1968) Resolution 1, CR 103). The unit of length is equal to the length of the path travelled by light in a vacuum during the time interval of 1/299 792 458 of a second (17th CGPM (1983) Resolution 1, CR 97). www.leessummit.us /project/wikipedia/index.php/SI_base_unit   (571 words)

 SI SI is sometimes referred to as the metric system (especially in the United States, which has not widely adopted it, and the UK, where conversion is incomplete). The unit of time is the duration of exactly 9 192 631 770 periods of the radiation corresponding to the transition between two hyperfine levels of the ground state of caesium-133 atom. The unit of angle is the angle subtended at the centre of a circle by an arc of the circumference equal in length to the radius of the circle. www.1-free-software.com /en/wikipedia/s/si/si.html   (1188 words)

 SI - Wikipedia, the free encyclopedia The six base units recommended were the metre, kilogram, second, ampere, Kelvin degree (later renamed the kelvin), and the candela. The presence of these adjustments has been one reason advocates of the U.S. customary units had used against metrication; these customary units, however, are nowadays defined in terms of SI units, thus any difference in the definition of the SI units results in a difference of the definition of the customary units. ISO 1000:1992 SI units and recommendations for the use of their multiples and of certain other units, with its price tag of 99 Swiss francs for a 22 page, coverless pamphlet showing why the public is sometimes a little slow to pick up on their recommendations. en.wikipedia.org /wiki/SI   (1545 words)

 Units: The International System For example, the SI unit of force, the newton, is defined to be the force that accelerates a mass of one kilogram at the rate of one meter per second per second. units for measurement of magnetism: the weber (flux), tesla (flux density), and henry (inductance); These units are supposed to be "defined in relation to the SI in every document in which they are used," and "their use is not encouraged." These barely-tolerated units might well be prohibited by future meetings of the CGPM. www.unc.edu /~rowlett/units/sipm.html   (1012 words)

 SI - Simple English Wikipedia Unit: ampere (A) The ampere is that constant electrical current (or flow) which, if maintained in two straight parallel conductors of infinite length, of negligible circular cross-section, and placed 1 metre apart in vacuum, would produce between these conductors a force equal to 2 × 10 Unit: kelvin (K) The kelvin, unit of temperature, is the fraction 1/273.16 of the thermodynamic temperature of the triple point of water. The candela is one of two base units (the other being the ampere) that is not defined purely in terms of base units. simple.wikipedia.org /wiki/SI_base_unit   (651 words)

 SI - a Whatis.com definition - see also: International System of Units The meter (abbreviation, m) is the SI unit of displacement or length. The kilogram (abbreviation, kg) is the SI unit of mass. SI derived units include the hertz, the newton, the pascal (unit of pressure or stress), the ohm, the farad, the joule, the coulomb, the tesla, the lumen, the becquerel, the whatis.techtarget.com /definition/0,,sid9_gci523539,00.html   (538 words)

 Essentials of the SI: Base & derived units Examples of such SI derived units are given in Table 2, where it should be noted that the symbol 1 for quantities of dimension 1 such as mass fraction is generally omitted. In photometry, the unit name steradian and the unit symbol sr are usually retained in expressions for derived units. For a graphical illustration of how the 22 derived units with special names and symbols given in Table 3 are related to the seven SI base units, see relationships among SI units. physics.nist.gov /cuu/Units/units.html   (468 words)

 American Society of Civil Engineers, Committee on Metrication The hertz is the SI unit of the frequency of a periodic phenomenon. The ohm is the SI unit of resistance of an electrical conductor. Unit symbols are the same whether singular or plural, and a space is left between the numerical value and the symbol. users.vnet.net /cmstone/metric/mfacts1.htm   (1223 words)

 Writer's Block - Writing Tips - SI Units (Metric system) (3) Because SI unit names and abbreviations are linked, in use, to numbers, the choice between using a unit name and a unit abbreviation depends on how the number is expressed. When the unit abbreviation is used, the space should usually be a hard space, as discussed in the May 1997 tip. SI abbreviations are never terminated by periods (except when they fall at the end of a sentence). www.writersblock.ca /tips/monthtip/tipdec97.htm   (381 words)

 Measurement - Units Dictionary F-J However, use of the SI unit, the candela per square meter, is generally accepted. Because the gallon, quart, and pint differ in the United States and the United Kingdom, the use of this unit and term is generally discouraged for scientific purposes. Use of the SI unit, the tesla, is preferred. www.batesville.k12.in.us /physics/ANet/Science/Measure/UnitsDictF2J.html   (923 words)

 SI Units The International system (SI) is a comprehensive and practical system of units of measure of all physical quantities for technical, scientific and general use. Multiples of the unit of mass are formed with the unit "gram" instead of the base unit "kilogram". The degree Celsius is the common unit for the measurement of temperature. whitewolf.newcastle.edu.au /techinfo/units_si.html   (780 words)

 Decimal Time - Metric Time The combination of units of this table with SI units to form derived units should be restricted to special cases in order not to lose the advantages of the coherence of SI units. Another alternative would be to use the day as the base unit for prefixes, but to use a submultiple, such as a milliday or microday, for derived units, as is currently done with the kilogramme, and as was previously done with the centimetre in the cgs system. In addition to the base units for independent quantities, such as time interval, derived quantities and units are obtained from equations derived from the base units; for instance, a coulomb of electric charge is defined as one second times one ampere. www.decimaltime.hynes.net /metric.html   (2005 words)

 Geol. 2005 Units & Conversions All SI units are in the metric system, but measurement has a specific unit that all measurements and equations use. For example, although the gram (g) is the base unit used in the metric system to measure mass, SI units use the kilogram (kg). When using SI units, you will often find that your answer has the correct numbers, but the decimal point is in the wrong place (the answer is the wrong order of magnitude). www.stolaf.edu /people/welchb/courses/geo2005/units.htm   (402 words)

 named derived SI unit concept from the Astronomy knowledge base The name coulomb was given to the unit at the first meeting of the IEC in Paris in 1881. radian (9 facts) (rad) - Unit of angular measure equal to the angle subtended at the centre of a circle by an arc the length of which is equal to the radius. One steradian is equal to the angle subtended at the centre of a sphere by an area of surface equal to the square of the radius. www.site.uottawa.ca:4321 /astronomy/namedderivedSIunit.html   (571 words)

 SI - Gurupedia symbol for the SI unit for pressure, named after Blaise Pascal, is Pa, whereas the unit itself is written pascal. The unit of time is the duration of exactly 9 192 931 770 periods of the radiation corresponding to the transition between two hyperfine levels of the ground state of caesium-133 atom. The unit of luminous intensity is the luminous intensity, in a given direction, of a source that emits monochromatic radiation of frequency 540 x 10 www.gurupedia.com /s/si/si.htm   (1123 words)

 IEP-SAC - ABCs of Metrology In addition to base units, SI unit of plane angle, the radian, and of solid angle, the steradian, were categorized as supplementary units. The kilogram is the unit of mass; it is equal to the mass of the international prototype of the kilogram. The unit for Celsius temperature is degree Celsius, symbol °C, which is equal in magnitude to the unit kelvin. www.iepsac.org /papers/p07c06.htm   (1648 words)

 Physics with Calculus: Part 0: The SI Unit System - Wikibooks The second unit is the kilogram, which is the SI unit of mass. The fourth SI unit is the ampere, whose symbol is A. The newton is the SI unit of force. en.wikibooks.org /wiki/Physics_with_Calculus:_Part_0:_The_SI_Unit_System   (507 words)

 [No title] SI units and their relative values were adopted by an international association of scientists meeting in Paris in 1960. Units of the SI system, units derived from the SI system, and their relationship to several English units. The SI units of volume are summarized in Table 2.4 and illustrated in Figure 2.2. genchem.chem.wisc.edu /sstutorial/Text2/Tx21/tx21.html   (1059 words)

 SI Metric System - Base Units - Length, Mass, Time, Electric Current, Thermo- dynamic temperature, Amount of substance ... The kelvin, unit of thermodynamic temperature, is the fraction 1/273,16 of the thermodynamic temperature of the triple point of water. The candela is the luminous intensity, in the perpendicular direction of a surface of 1/600000 square metre of a flbody at the temperature of freezing platinum under a pressure of 101 325 newtons per square metre. The unit "degree Celsius" is therefore equal to the unit "kelvin" and an interval or difference in Celsius temperature is also expressed in degrees Celsius (ºC). www.simetric.co.uk /sibasis.htm   (590 words)

 Brownridge SI Material Pronounce units and their multiples with the primary stress on the first syllable, so the sound of the prefix won't be lost. The SI unit of force is derived from this equation. The SI unit of energy is therefore newton meter (N·m). lamar.colostate.edu /~hillger/brownridge.html   (3745 words)

 Unit Systems in Electromagnetism Even were everyone to adopt the 'new' SI units the need for familiarity with the older CGS systems would remain in order to understand the large number of original works published in the latter. The approach taken by the SI In the SI, distance is measured in metres and force is measured in newtons (the force which when applied to a mass of one kilogram accelerates it at one metre per second squared). The units should be of a size that is appropriate for use in science and engineering and in everyday ('customary') use by the wider commercial and public community. www.ee.surrey.ac.uk /Workshop/advice/coils/unit_systems   (3404 words)

 Unit Conversion Tables The International System of Units (SI units) is rapidly becoming the most commonly used in the world. And the fact that in the SI system the unit of force is the Newton, while the kilogram is reserved strictly for mass, makes it important to designate whether a non-SI unit such as the pound is being used to describe mass or force (or weight). Thus the quantity often called "weight" is actually the mass, and must be properly described in mass units, the kilogram in SI units or the pound and ounce in English units. www.sapiensman.com /conversion_tables   (1444 words)

 International System A large number of derived units formed by combining base units according to the algebraic relations of the corresponding quantities (some of which are assigned special names and symbols and which themselves can be further combined to form even more derived units). The derived units are coherent in the sense that they are all mutually related only by the rules of multiplication and division with no numerical factor other than 1 needed. The SI unit of electric current is the ampère [A] The SI unit of thermodynamic temperature is the kelvin [K]. hypertextbook.com /physics/foundations/system-international/index.shtml   (2743 words)

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