METRICATION 67 UNITS ALLOWED IN CONJ UNCTION WITH SI physical quantity name of unit symbol for unit definition o.t unit length paraec pc 30.87 x 10 '5 m area barn b 10 -28 m z hectare ha 10 4 m 2 volume litre 1 10 -3 m 3 pressure bar bar 103 N m -2 mass tonne t 10 3 kg = 1 Mg kinematic viscosity stokes St 10 -4 m 2 s -• diffusion coefficient dynamic viscosity poise P 10 -x kg m -• s -• magnetic flux density gauss G 10 -4 T (magnetic induction) radioactivity curie Ci 37 x 109 s-' energy electron volt eV 1.6021 x 10 -'9 J time hour h EXAMPLES OF UNITS CONTRARY TO SI, WITH THEIR EQUIVALENTS* physical quantity unit equivalent length •ngstr6m 10 -•ø m inch 0.0254 m foot 0.8048 m yard 0.9144 m area square inch 645.16 mm 2 square foot 0.092 903 m 2 square yard 0.836 127 m 2 volume cubic inch 1.638 71 x 10 -5 m 3 cubic foot 0.028 316 8 m 3 U.K. gallon 0.004 546 092 m 3 U.S. gallon 0.003 785 41 m 3 fluid ounce 28.413 1 cm 3 mass pound 0.453 592 37 kg ounce 28.349 5 g dram 1.771 85 g grain 64.798 9 mg density pound/cubic inch 2.767 99 x 104 kg m -3 pound/cubic foot 16.0185 kg m -3 concentration ounce/gallon 6.236 02 g 1-' force dyne 10- $ N poundal 0.138 255 N pound-force 4.448 22 N kilogramme-force 9.806 65 N pressure atmosphere 101.325 kN m -2 tolT 133.322 N m -2 pound (f)/sq.in. 6894.76 N m -2 ---- 6.894 76 kN m -2 inch of mercury 3386.39 N m -2 ener•,•y erg 10 -? J therm 105.506 MJ calorie (I.T.) 4.1868 J calorie (15 øC) 4.1855 J calorie (thermochemical) 4.184 J B.t.u. 1055.06 J -- 1.055 06 kJ foot poundal 0.042 140 1 J foot pound (f) 1.355 82 J power horse power 745.700 W=0.745 700 kW temperature degree Ranldne • øK degree Fahrenheit t/øF=•T/øCq- 32 * Fuller lists are to be found in Anderton, P. and Bigg, P. H. Changing to the metric system. 2nd edn. (1967). (H.M. Stationery Office, Londonk

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