UNIT CONVERSIONS AREA  [L2] 1 square centimeter = 0.155 square inch 1 square meter = 10.764 square feet 1 hectare = 2.471 acres 1 hectare = 10,000 square meters 1 square kilometer = 0.3861 square miles 1 hectare = 0.003861 square miles 1 square inch = 6.4516 square centimeters 1 square foot = 0.0929` square meters 1 acre = 0.4047 hectares 1 acre = 43,560 square feet 1 square mile = 2.59 square kilometers 1 square mile = 259 hectares DENSITY  [M L-3] 1000 kilograms per cubic meter = 1.94 slugs per cubic foot 1 slug per cubic foot = 515.5 kilograms per cubic meter DISCHARGE (FLOW RATE)  [L3 T -1] 1 cubic meter per second = 35.315 cubic foot per second 1 cubic foot per second = 0.028317 cubic meters per second 1000 gallons per minute (1000 gpm) = 2.228 cubic feet per second 1 million gallons per day = 0.04381 cubic meters per second ENERGY (WORK OR QUANTITY OF HEAT) [F L] 1 joule = 1 newton-meter 1 joule = 0.7375 foot-pound 1 calorie = 4.184 joules 1 kilowatt-hour = 3,414 Btu 1 kilowatt-hour = 3,600,000 joules 1 Btu = 777.76 foot-pound 1 foot-pound = 1.3558 joules 1 Btu = 1,054.5 joules 1 Btu = 0.0002929 kilowatt-hour 1 Btu = 252 calories ENERGY PER UNIT AREA  [F L L-2] 1 langley = 1 calorie per square centimeter FORCE (WEIGHT)  [F] 1 newton = 0.22482 pounds 1 kilogram = 2.2046 pounds 1 kilogram = 9.806 newtons 1 metric ton = 1000 kilograms 1 metric ton = 9.806 kilonewtons 1 metric ton = 2204.6 pounds 1 pound = 4.448 newtons 1 pound = 0.4536 kilograms 1 ton = 2000 pounds 1 ton = 0.9072 metric tons LENGTH (DISTANCE)  [L] 1 millimeter = 0.03937 inches 1 centimeter = 0.3937 inches 1 meter = 3.2808 feet 1 kilometer = 0.62137 miles 1 meter= 1.0936 yards 1 inch = 25.4 millimeters 1 inch = 2.54 centimeters 1 foot = 0.3048 meters 1 mile = 1.609344 kilometers 1 yard = 0.9144 meters MASS  [M] 1 kilogram = 2.2046 pounds 1 kilogram = 0.068522 slugs 1 pound = 0.4536 kilograms 1 slug = 14.5939 kilograms POWER  [F L T -1] 1 watt = 1 joule per second 1 watt = 1 newton-meter per second 1 kilowatt = 1.341 horsepower 1 horsepower = 550 foot-pound per second 1 horsepower = 0.7457 kilowatts PRESSURE  [F L-2] 1 pascal = 1 newton per square meter 1 kilopascal = 1000 pascal 1 kilopascal = 0.145045 lbs per square inch 1 lb per square inch = 6.8944 kilopascals 1 lb per square inch = 6894.4 pascals SPECIFIC WEIGHT  [F L-3] 1 newton per cubic meter = 0.006366195 pounds per cubic foot 1 pound per cubic foot = 157.08 newtons per cubic meter VELOCITY  [L T -1] 1 meter per second = 3.2808 feet per second 1 kilometer per hour = 0.62137 miles per hour 1 foot per second = 0.3048 meters per second 1 mile per hour = 1.60935 kilometers per hour VISCOSITY (ABSOLUTE)  [F T L-2] 1 poise = 0.1 newton-second per square meter 1 poise = 0.002088647 lb-second per square foot 1 centipoise = 0.01 poise 1 lb-second per square foot = 478.779 poise 1 lb-second per square foot= 47,877.9 centipoise VISCOSITY (KINEMATIC)  [L2 T -1] 1 stoke = 1 square centimeter per second 1 centistoke = 0.01 stoke 1 centistoke = 0.000001 square meter per second 1 centistoke = 0.000010764 square feet per second 1 square foot per second = 929.0227 stoke 1 square foot per second = 92,902.27 centistoke VOLUME  [L3] 1 liter = 0.26417 U.S. gallons 1 liter = 0.035315 cubic feet 1 liter = 0.001 cubic meter 1 cubic meter = 35,315 cubic feet 1 cubic meter= 1.3079 cubic yards 1 cubic meter = 264.17 U.S. gallons 1 cubic hectometer = 1 million cubic meters 1 cubic hectometer = 810.713 acre·feet 10,000 cubic meters = 4.08734 (ft3/s)·day 1 U.S. gallon = 3. 78541 liters 1 cubic foot = 28.3168 liters 1 U.S. gallon = 0.13368 cubic feet 1 cubic foot = 0.0283168 cubic meters 1 cubic yard = 0.76458 cubic meters 1 million U.S. gallons = 3,785.41 cubic meters 1 million cubic feet = 28,316.84 cubic meters 1 acre·foot = 1233.48 cubic meters 1 (ft3/s)·day = 2446.58 cubic meters 1 (ft3/s)-day = 1.98347 acre-feet

COMMON CONSTANTS GRAVITATIONAL ACCELERATION 9.806 meters per square second 980.6 centimeters per square second 32.17 feet per square second DENSITY OF WATER (AT 4°C) 1000 kilograms per cubic meter 1 gram per cubic centimeter 1.94 slugs per cubic foot 1.94 (lb-f)-s2/ft4 SPECIFIC WEIGHT OF WATER At 4°C and 760 mm Hg: 9.806 kilonewtons per cubic meter At 20.2°C and 760 mm Hg: 9.789 kilonewtons per cubic meter 62.43 lb-f per cubic foot 62.32 lb-f per cubic foot STANDARD SEA-LEVEL ATMOSPHERIC PRESSURE 1013.25 millibars 1033.6 gm/cm2 101.325 kilonewtons per square meter 101.325 kilopascals 760 mm Hg 10.336 meters of H2O 14.696 lb per square inch 29.92 inches Hg 33.91 feet of H2O

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