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A

• Acre (US) = 0.0015625 square miles, 10 square chains (Gunter's), 160 square rods (square perches), 4840 square yards, 43,560 square feet, 100,000 square links (Gunter's), 0.4046873 hectares (square hectometers), 40.46873 ares (square dekameters), 4046.873 square meters.
• Acre (Br) = 4 Br roods, 4840 square Br yards, 0.4046849 hectares (square hectometers), 4046.849 square meters.
• Acre Foot (US) = 43,560 cubic feet, 1,613.33 cubic yards, 325,872 gallons, 1233.5 cubic meters, 1,233,489 liters.
• Acres inches = 27,154 gallons.
• Acres inch per hour = 452 GPM.
• Angstrom Unit = 3.937x10^-9 inch, 0.003937 millionths of an inch, 1x10^-10 meters, 1x10^-8 centimeters, 1x10^-4 microns, 0.1 milli-micron (micro-millimeter), 100 millionth microns (micro-microns).
• Angular mil = 1x10^-3 radians.
• Are = 3.8610x10^-5 square mile, 0.02471044 acre, 119.60 square yards, 1076.4 square feet, 0.01 hectare, 1 square dekameter, 100 square meters.
• Astronomical Unit = 1.495x10^8 kilometers, 0.48481x10^-5 parsecs, 1.5812x10^-5 light years.
• Atmosphere (pressure) = Pressure exerted by 76 cm of Hg at density 13.5951 grams per cubic centimeter at G=980.665 centimeters per square second, 0.0073480 ton (2000 pound) per square inch, 1.0133 bars, 1.0581 tons (2000 pound) per square foot, 14.696 pounds per square inch, 29.921 inches of Hg at 32 degrees F, 33.899 feet of water at 39.1 degrees F, 760 millimeters of Hg at 0 degrees C, 1033.2 grams per square centimeter, 2116.2 pounds per square foot, 1.0332x10^4 kilograms per square meter, 1.01325x10^6 dynes per square centimeter, 101.325 kPascal.

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  B

• Bag (Br) = 3 dry bushels, 0.109107 cubic meter.
• Bar (pressure) = 0.98692 atmosphere, 14.504 pounds per square inch, 1.01971x10^4 kilograms per square meter, 1.000x10^6 dynes per square centimeter.
• Barye (pressure) = 1 dyne per square centimeter.
• Barleycorn (Br) = 1/3 inch, 0.84667 centimeters.
• Barn = 1x10-3 radians, 1x10^24 square centimeters.
• Barrel (US dry) = 3.281 bushels, 105.0 dry quarts, 7056 cubic inches except cranberry barrel which equals 5826 cubic inches, 0.11562 cubic meter.
• Barrel (US liquid) = 42 gallons (oil), 31.5 gallons (beer), 30.0 gallons (wine), 0.11924 cubic meter.
• Barrel (Br dry) = 36 Br gallons, 0.16366 cubic meter.
• Board Foot = 1/12 cubic foot, 144 cubic inches (1 ft x 1 ft x 1 in), 2359.8 cubic centimeters.
• Bolt (US Cloth) = 120 linear feet, 36.576 meters.
• British Thermal Unit (BTU, mean) = 0.25198 kilogram calorie (large mean calorie), 777.97 foot pounds, 3.9292x10^-4 horsepower hour, 2.930x10^-4 Kilowatt hour, 0.2930 watt hour, 10.409 liter atmospheres, 107.56 kilogram meters, 251.98 mean gram calories, 1054.8 absolute joules, 0.3676 cubic foot atmospheres, 2.5030x10^4 foot poundals, 1.0548x10^10 ergs.
• BTU (39 degrees F) = 1060.4 absolute joules.
• BTU (60 degrees F) = 1054.6 absolute joules.
• BTU per Minute = 12.96 foot pounds per second, 0.02356 horsepower, 0.01757 kilowatts, 17.57 watts.
• Bucket (Br dry) = 4 Br gallons, 1.8184x10^4 cubic centimeters.
• Bushel (US dry) = 0.304785 barrel, 0.96895 Br bushel, 1.2444 cubic feet, 4 pecks, 32 dry quarts, 64 dry pints, 2150.42 cubic inches, 0.035239 cubic meter, 0.35238 hectoliter, 3.5238 dekaliters, 35.238 liters, 3.5239x10^4 cubic centimeters.
• Bushel (Br dry) = 1/8 Br quarter, 1/3 Br bag, 1.03205 bushels, 1.2843 cubic feet, 8 Br gallons, 2219.3 cubic inches, 0.363677 hectoliter, 3.63677 dekaliters, 36.3677 liters, 3.6369x10^4 cubic centimeters.
• Butt (Br dry) = 126 gallons, 0.57281 cubic meter.

  C

• Cable Length = 720 feet, 219.46 meters.
• Calorie - see gram calorie or kilogram calorie.
• Carat = 3.08647 grains, 205.6 milligrams.
• Cental = 100 pounds, 45.359 kilograms.
• Centare = 1.196 square yards, 10.764 square feet, 1550 square inches, 0.01 are, 1 square meter.
• Centigram = 0.1543236 grain, 0.01 gram.
• Centiliter = 0.33815 fluid ounce, 0.61025 cubic inch, 2.705179 fluid drams, 0.01 liter, 10.000027 cubic centimeters.
• Centimeter = 0.01093611 yard, 0.01093614 Br yard, 0.032808 foot, 0.39370 inch, 4.4330 linges (Paris lines), 393.70 mils, 0.01 meter, 10 millimeters, 1x10^4 microns, 1x10^7 milli-microns (micro-millimeters)1x10^8 Angstroms.
• Centimeter-dyne = See erg.
• Centipoise (viscosity) = 0.01 poise, centistokes x density at a given temperature.
• Centistoke (viscosity) = 0.01 stoke.
• Chain (Engineer's or Ramden's) = 100 feet, 100 links of 1 foot, 30.4801 meters.
• Chain (Surveyor's or Gunter's) = 0.1 furlong, 0.0125 mile, 4 rods, 22 yards, 66 feet, 100 links, 792 inches, 20.117 meters, 2011.7 centimeters.
• Chaldron (US dry) = 36 bushels (variable), 1.2686 cubic meters.
• Chaldron (Br dry) = 32 Br bushels (variable), 1.1638 cubic meters.
• Cheval-vapeur = for electrical purposes, usually 736 watts.
• Cheval-vapeur heure = 2.6478x10^6 joules (absolute).
• Circle = 2 Pi, 6.28319 radians, 12 signs, 360 degrees.
• Circular inch = area of a circle the diameter of which is one inch, 0.78540 square inch, 5.0671 square centimeters.
• Circular mil = area of a circle the diameter of which is one mil or 1/1000 inch, 7.854x10^-7 square inch, 0.78540 square mil, 5.0671 square centimeter, 5.0671x10^-4 square millimeter.
• Circular millimeter = area of a circle the diameter of which is one millimeter, 0.0078450 square centimeter, 0.78540 square millimeter.
• Circumference = 2 Pi, 6.28319 radians, 360 degrees, 400 grades, 2.1600x10^4 minutes, 1.296000x10^6 seconds.
• Clove or customary stone (Br) = 8 pounds, 3.6287 kilograms.
• Coomb (Br dry) = 4 bushels, 0.14548 cubic meter.
• Cord = 8 cord feet, 128 cubic feet (8 x 4 x 4), 3.625 cubic meters.
• Cord foot = 1/8 cord, 16 cubic feet (4 x 4 x 1).
• Cubic centimeter = 1.3079x10^-6 cubic yard, 2.83776x10^-5 bushel, 2.7496x10^-5 Br bushel, 3.531445x10^-5 cubic foot, 3.531477x10^-5 Br cubic foot, 2.6417x10^-4 gallon, 2.1997x10^-4 Br gallon, 4.2376x10^-4 board foot, 0.0010567 liquid quart, 8.7988x10^-4 liquid Br quart, 9.0808x10^-4 dry quart, 0.0021134 liquid pint, 0.0018162 dry pint, 0.033814 fluid ounce, 0.035195 fluid Br ounce, 0.061023 cubic inch, 0.27051 fluid dram, 0.38257 fluid Br drachm, 16.231 minims, 16.894 Br minims, 1x10^-6 cubic meter, 9.9997x10^-4 liter, 0.001 cubic decimeter, 0.99997 milliliter, 1000 cubic millimeters.
• Cubic centimeter-atmosphere (normal) = 0.101325 joule (absolute).
• Cubic Decimeter = 0.0013079 cubic yard, 0.035314 cubic foot, 61.023 cubic inches, 0.001 cubic meter, 0.99997 liter, 1000 cubic centimeters.
• Cubic Dekameter = 1000 cubic meters.
• Cubic Foot (US) = 1/128 cord, 0.01 Br register ton, 1/27 cubic yard, 1/16 cord-foot, 0.80357 bushel, 0.77861 Br bushel, 7.481 gallons, 6.229 Br gallons, 12 board feet, 25.714 dry quarts, 29.922 liquid quarts, 59.844 liquid pints, 1728 cubic inches, 0.02831701 cubic meter, 28.316 liters, 2.8317x10^4 cubic centimeters.
• Cubic foot (BR) = 0.02831677 cubic meter, 2.831677x10^4 cubic centimeters.
• Cubic foot (of water) = 62.4 pounds, 999.8 ounces, 28.315 kilograms.
• Cubic foot-atmosphere = 2.7203 BTU (mean), 28.313 liter-atmosphere, 292.59 kilogram-meters, 680.74 gram-calories (mean), 2116.3 foot pounds, 2869.4 joules (absolute).
• Cubic inch (US) = 2.143347x10^-5 cubic yard, 4.65025x10^-4 bushel, 5.78704x10^-4 cubic foot, 0.00186010 peck, 0.0043290 gallon, 1/144 board foot, 0.014881 dry quart, 0.017316 liquid quart, 0.0297616 dry pint, 0.5541 fluid ounce, 4.4329 fluid drams, 1.6387162x10^-5 cubic meter, 0.0163868 liter, 1.63868 centiliters, 16.3868 milliliters, 16.387162 cubic centimeters, 1.6387162x10^4 cubic millimeters.
• Cubic inch (Br) = 4.5081x10^-4 Br bushel, 5.7870x10^-4 Br cubic foot, 0.0018031 Br peck, 0.003606 Br gallon, 16.3870253 cubic centimeters.
• Cubic Hectometer = 1x10^6 cubic meters.
• Cubic Kilometer = 1x10^9 cubic meters.
• Cubic Meter = 0.2759 cord, 1.3079428 cubic yards, 1.307954 cubic Br yards, 28.3776 bushels, 35.314445 cubic feet, 35.31477 Br cubic feet, 264.173 gallons, 1056.7 liquid quarts, 2113.4 liquid pints, 6.1023x10^4 cubic inches, 1 stere, 999.973 liters, 1000 cubic decimeters, 1x10^6 cubic centimeters, 1x10^9 cubic millimeters.
• Cubic Millimeter = 6.1023x10^-5 cubic inch, 0.01623 minim, 0.01689 BR minim, 1x10^-9 cubic meter, 0.001 cubic centimeter.
• Cubic Yard (US) = 27 cubic feet, 202.0 gallons, 168.17 Br gallons, 807.9 liquid quarts, 1616 liquid pints, 4.6656x10^4 cubic inches, 0.76455285 cubic meter, 764.54 liters, 7.6455945x10^5 cubic centimeters.
• Cubic Yard (Br) = 27 cubic feet, 0.76455945 cubic meter.
• Cubit = 18 inches, 45.72 centimeters.

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