Unit Conversion for Aviation Industry

CONVERSION FACTORS (US AND METRIC) __________________________________ The following table of conversion factors includes all the units used in the maintenance of an engine and for all the practices described in the Standard Practices Manual. After making the conversion calculation, the answer should be rounded off to the nearest decimal unit to the accuracy required by the appropriate instructions. LENGTH ______ 1 mil (mil) = 0.001 in. or (25,4 microns) 1 inch (in.) = 25,4 millimeters (mm) 1 foot (ft) = 0,3048 m or (30,48006 cm) 1 yard (yd) = 0,9144 meter (m) 1 meter (m) = 39.37 inches (1.0936 yards) 1 centimeter (cm) = 0.3937 inch 1 millimeter (mm) = 0.03937 inch 1 micron ( ) = 0,001 mm or 3.937 x 10-5 in. AREA ____ 1 square inch (in2) = 645,16 square millimeters (mm2) (6,4516 square centimeters (cm2) 1 square foot (ft2) = 0.0929 square meter (m2) 1 square meter (m2) = 1.196 square yards (yd2) (10.764 square feet) 1 square centimeter (cm2) = 0.1550 square inch VOLUME ______ 1 cubic inch (in3) = 16,387 cubic centimeters (cc) 1 cubic foot (ft3) = 0,028 cubic meter (m3) (28,316 liters) 1 cubic centimeter (cc) = 0.06102 cubic inch 1 cubic meter (m3) = 35.314 cubic feet (1.308 cu yd) 1 fluid ounce (fl oz) = 29,57 cubic centimeters (cm3) 1 quart (qt) = 0,946 liter (946,333 cm3) 1 US gallon (US gal) = 3,785 liters 1 liter (1) = 1.0567 quart (0,001 cubic meter)(0.264 US gallon) WEIGHT ______ 1 ounce (oz) = 28,35 grams (g) 1 pound (lb) = 0,4536 kilogram (kg)(453,5924 grams) 1 gram (g) = 0.035 ounce 1 kilogram (kg) = 2.2046 pounds PRESSURE ________ 1 pound/square inch (psi) = 6,90 kilopascal (kPa) 1 kilopascal (kPa) = 0.145 pound/square inch (psi) 1 torr = 1 mm Hg 1 bar = 14,5 pound/square inch (psi) CONCENTRATION _____________ 1 ounce per US gallon = 7,5 grams/liter 1 fluid ounce/us gallon = 7,8 ml/liter 1 pound/US gallon = 0,1190 kg/l, or grams/cc (119,8 grams/liter) 1 g/l = 0.1335 oz/US gallon 1 ml/l = 0.128 fl oz/US gallon TORQUE ______ 1 pound-foot (lb ft) = 12 (lb in.) 1 pound-inch (lb in.) = 0,113 Newton meter (N.m) 1 N.m = 8.85 pound-inch (lb in.) TEMPERATURE ___________ Fahrenheit (`F) = 9/5`C + 32 Celsius (`C) = 5/9 (`F - 32) Kelvin (K) = `C + 273,15 Kelvin (K) = 5/9 (`F + 459.67) Rankin (`R) = `F + 459.688 SPECIFIC HEAT CAPACITY ______________________ 1 Btu/lb = 0,55 cal/g 1 cal/g = 1.8 Btu/lb DISTANCE ________ 1 mile (US Statute) = 1,609 kilometers (km) 1 mile (Nautical) = 1,853 kilometers 1 kilometer (km) = 0.621 miles (US Statute) METRIC RELATIONSHIPS ____________________ 1 micrometer ( m) = 0,000001 meter (0.001 millimeter) 1 millimeter (mm) = 0,001 meter 1 centimeter (cm) = 0,01 meter 1 decimeter (dm) = 0,1 meter 1 meter (Metric Standard of length) 1 liter = 0,001 cubic meter 1 gram = weight of 0,001 liter of water 1 bar = 105 Pascal (Pa) 1 Pascal (Pa) = 1 N/m2 1 Newton (N) = 0,102 kilogram (kg) 1 kilogram/square millimeter (kg/mm2) = 9,81 Megapascal (MPa) MAGNETIC FIELD ______________ 1 Ampere/meter (A/m) = 2,54 x 10-2 Ampere inch (A/in.)