Conversion factors

 Numerical π = 3.142 π2 = 9.87 Area   Force 1 N = 105 dyn = 0.2248 lb f 1 lb f = 4.4482 N 1 Kg f = 9.81 N Density    1 g cm-3 = 1000 kgm3 1 g cm-3= 1kg L-1 Volume   Pressure   Energy   Angle and angular speed π rad = 180o 1 rad = 57.30o Magnetic flux 1 Wb = 108 maxwell 1 maxwell = 10-8 Wb Resistance 1 M Ω = 106 Ω 1 Ω = 106 µ Ω Length 1 m = 102 cm = 1.0936 yards 1m = 3.281 feet = 39.37 inches 1 Km = 103 m = 0.6215 miles 1 mile = 5280 feet = 1.609 km 1 inch = 2.54 cm 1 yd = 3 feet = 91.44 cm 1 light year = 9.461 X 1015 m 1 AU (astronomical unit) = 1.496 X 1011 m 1 µ (micron) = 10-6 m 1 A (angstrom) = 0.1 nm = 10-8 cm = 10-10 m Time 1 hour = 60 min = 3600 seconds 1 day = 24 hours = 1440 minutes = 86400 seconds 1 year = 365.24 days = 3.156 X 107 seconds Mass 1 kg = 1000 g  = 2.205 lb = 6.022 X 1023 amu 1 lb = 453.6 g = 0.4536 kg 1 amu = 1.6606 X 10-27 kg = 931,5 Mev / c2 1 tonne = 1000 kg = 106 kg 1 slugg = 14.59 kg Speed 1 kmh-1 = 0.2778 ms-1 = 0.6215 miles.hour-1  1 miles.hour-1 = 0.4470 ms-1 = 1.609 kmh-1 Current 1 µ A = 10-6 A 1 mA = 10-3 A Electric field 1 NC-1 = 1 Vm-1 = 10-2 Vcm-1  Magnetic field strength 1 T = 104 G 1 G = 10-4 T Capacitance 1 F = 9 X 1011 stF 1 µF = 10-6 F 1 pF = 10-12 F