appendixcr - k 10 6 mega M 10 9 giga G 10 12 tera T...

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C Page 1 UNITS Appendix C C In 1873 the centimeter, the gram and the second were selected as basic scientifc units by the British Association For the Advancement oF Science. Thus the C.G.S. system became the most widely used in scientifc work. Practical considerations, however, encouraged a gradual change to the MKSA System based on the meter, the kilogram, the second and the ampere. In 1954 the ‘ConFérence Générale des Poids et Mesures’ adopted this system which, with the addition oF the ‘Kelvin’ as a unit oF temperature and the’ candela’ as a unit oF luminous intensity became in 1960 the ‘Système International d’Unités’ or SI. C.G.S. units are still used in some scientifc work, and may be used in the elementary laboratory without penalty; but For preFerence SI units should be chosen. ±ractional and Multiple Prefxes ±raction Prefx Symbol 10 -18 atto a 10 -15 Femto F 10 -12 pico p 10 -9 nano n 10 -6 micro µ 10 -3 milli m 10 3 kilo
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Unformatted text preview: k 10 6 mega M 10 9 giga G 10 12 tera T Obsolescent units length: 1 micron = 10-6 m = 1 mm 1 angstrom = 10-10 m = 0.1 nm Force: 1 dyne = 10-5 N energy: 1 erg = 10-7 J 1 calorie = 4.1855 J pressure: 1 bar = 10 5 Pa = 100 kPa 1 atmosphere = 1.01325 x 10 5 Pa = 101.325 kPa 1 torr = 1 mm oF Hg = 133.322 Pa viscosity: 1 poise = 10-1 Nsm -2 = 1 Pa s volume: 1 litre = 10-3 m 3 allowed unit 1 milliliter = 10-6 m 3 allowed unit C Page 2 Quantity Derived units S.I. Unit Symbole Length meter m Mass kilograms kg Time second s Electric current ampere A Temperature kelvin K Luminous intensity candela cd Force (kg ms-2 ) newton N Energy (N m) joule J Power (J s-1 ) watt W Electric charge (A s) coulomb C Electric potential (J C-1 ) volt V Electric resistance (V A-1 ) ohm Electric capacitance (C V-1 ) farad F Electric inductance (V s A-1 ) henry H Frequency (s-1 ) hertz Hz Temperature ( T ( o C) = T(K)-273.15) degree Celsius o C Pressure kPa pascal Pa...
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appendixcr - k 10 6 mega M 10 9 giga G 10 12 tera T...

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