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Units_and_constants - Prefix exa peta tera giga mega kilo...

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Prefix Abbreviation Magnitude Derivation exa E 10 18 Greek ex , “beyond” peta P 10 15 Greek petasos , “outreach” tera T 10 12 Greek teras , “monster” giga G 10 9 Latin gigas , “giant” mega M 10 6 Greek megas , “great” kilo k 10 3 Greek chilioi , “a thousand” milli m 10 -3 Latin mille , “a thousand” micro μ 10 -6 Greek mikros , “small” nano n 10 -9 Greek nanos , “dwarf” pico p 10 -12 Spanish pico , “small quantity” femto f 10 -15 Danish femten , “fifteen” atto a 10 -18 Danish atten , “eighteen” Fundamental Units Name of dimension or quantity Symbol Description SI unit and abbreviation Equivalent units Dimension Current I time charge ampere (A) 6.25×10 18 electron charges per second = s C I Length L, l meter (m) 1,000 mm = 100 cm L Mass M, m kilogram (kg) 1,000 g M Time T, t second (s) 60 1 min = 600 , 3 1 hr = 400 , 86 1 day T Mechanical units Name of dimension or quantity Symbol Description SI unit and abbreviation Equivalent units Dimension Acceleration a 2 time length time velocity = 2 second meter kg N 2 T L Area A, a, s length 2 meter 2 (m 2 ) L 2 Energy or work W force × length = power × time joule (J) N m = W s = V C = 10 7 ergs = 10 8 dynes mm 2 2 T ML Energy density w volume energy 3 meter joule (J m -3 ) 3 100 1 mm erg 2 LT M
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