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# SI UNITS AND CONVERSION FACTORS

ACCELERATION

feet per second per second = 30.48 centimeters per second per second
= 0.3048 meters per second per second

free fall (standard) = 9.8067 meters per second per second

kilometers per hour per second = 27.778 centimeters per second per second
= 0.9113 feet per second per second
= 0.27778 meters per second squared

ANGULAR

degrees per second = 0.017453 radians per second
= 0.16667 revolutions per minute
= 0.0027778 revolutions per second

radians per second = 57.296 degrees per second (angular)
= 9.549 revolutions per minute

revolutions per minute = 6 degrees per second

AREA

acres = 43560 square feet
= 4046.9 square meters
= 0.40469 hectares

circular mils = 0.000007854 square inches
hectares = 2.471 acres
= 107639 square feet
= 10000 square meters

square centimeters = 0.155 square inches

square feet = 0.000022956 acres
= 0.092903 square meters

square inches = 6.4516 square centimeters

square kilometers = 247.1 acres
= 0.3861 square miles

square meters = 0.0002471 acres
= 10.764 square feet

square miles = 640 acres
= 2.59 square kilometers

square yards = 0.00020661 acres
= 0.83613 square meters

CANDLEPOWER

foot candles = 10.764 lumens per square meter

DENSITY, MASS/VOLUME

grams per cubic centimeter = 0.001 kilograms per cubic meter
= 0.03613 pounds per cubic inch
= 62.427 pounds per cubic foot

pounds-mass per cubic foot = 16.018 kilograms per cubic meter

pounds per cubic foot = 0.016018 grams per cubic centimeter
= 16.018 kilograms per cubic meter
= 0.0005787 pounds per cubic inch

pounds per cubic inch = 27.68 grams per cubic centimeter
= 27.68 kilograms per cubic meter
= 1728 newtons per meter

ENERGY AND WORK

British thermal units = 1055 joules

British thermal units per second = 1.055 watts

British thermal units per minute = 0.02358 horsepower
= 17.58 watts

British thermal units per hour = 0.2931 watts

calories = 0.0039683 British thermal units
= 3.088 foot-pounds
= 4.1868 joules
= 0.4265 kilogram-meters
= 0.001163 watt-hours

ergs = 0.0000001 joules

foot-pounds-force = 0.001285 British thermal units
= 0.3238 calories
= 0.000000505 horsepower hours
= 1.3558 joules
= 0.0003238 kilocalories
= 0.13825 kilogram-force meters
= 3.766E-07 kilowatt hours

horsepower = 42.43 British thermal units per minute
= 33000 foot-pounds-force per minute
= 550 foot-pounds-force per second
= 10.69 kilocalories per minute
= 0.7457 kilowatts
= 1.0139 horsepower (metric)
= 745.7 watts

horsepower-boiler = 33479 British thermal units per horse
= 9.8095 kilowatts
= 34.5 pounds of water evaporated per hour at 212°F

horsepower hours = 2.545 British thermal units
= 1980000 foot-pounds-force
= 2684500 joules
= 641.5 kilocalories
= 273200 kilogram-force meters
= 0.7457 kilowatt hours

joules = 0.0009484 British thermal units
= 0.239 calories
= 0.73756 foot-pounds-force
= 0.00027778 watt-hours

kilowatts = 56.92 British thermal units per minute
= 44254 foot-pounds-force per minute
= 737.6 foot-pounds-force per second
= 1.341 horsepower
= 14.34 kilocalories per minute

kilowatt hours = 3413 British thermal units
= 2655000 foot-pounds-force
= 1.341 horsepower hours
= 3.6 joules
= 860 kilocalories
= 367100 kilograms-force meters

pounds-force = 0.45359 kilograms-force
= 4.4482 newtons

tons of refrigeration = 12000 British thermal units per hour
= 288000 British thermal units per 24 hours

watts = 0.05691 British thermal units per minute
= 0.73756 foot-pounds-force per second
= 44.254 foot-pounds-force per minute
= 0.001341 horsepower
= 1 joules per second
= 0.01434 kilocalories per minute

watt-hours = 3.413 British thermal units
= 2665 foot-pounds-force
= 0.001341 horsepower hours
= 3600 joules
= 0.8604 kilocalories
= 367.1 kilograms-force-meters

There are several definitions of the Btu, and the values of applicable and/or equivalent factors may vary slightly depending on the definition used. For this reason, three or four significant figures are given on this page, and in most cases provide a value near to most definitions of the Btu. However, as always in making calculations of high accuracy, one should reference the appropriate lists and handbooks of standards.

ENERGY/AREA TIME

Btu/cubic feet second = 11348 watts per square meter

Btu/cubic feet hour = 3.1525 watts per square meter

FLOW RATE MASS

pounds per minute = 0.4536 kilograms per minute

FLOW RATE VOLUME

cubic feet per minute = 471.9 cubic centimeters per second
= 0.0004719 cubic meters per second
= 1.699 cubic meters per hour
= 0.4719 liters per second
= 0.2247 gallons (US) per second
= 62.32 pounds of water per minute (at 68°F)

cubic feet per second = 0.028317 cubic meters per second
= 1.699 cubic meters per minute
= 101.9 cubic meters per hour
= 448.8 gallons (US) per minute
= 646315 gallons (imp) per hour
= 28.32 liters

cubic meters per hour = 0.016667 cubic meters per minute
= 0.00027778 cubic meters per second
= 4.4033 gallons (US) per minute
= 0.27778 liters per second

cubic meters per second = 3600 cubic meters per hour
= 15850 gallons (US) per minute

gallons (US) per minute = 0.00006309 cubic meters per second
= 0.0037854 cubic meters per minute
= 0.2771 cubic meters per hour
= 0.002228 cubic feet per second
= 8.021 cubic feet per hour
= 0.06309 liters per second

liters per minute = 0.0005885 cubic feet per second
= 0.01667 liters per second
= 0.004403 gallons (US) per second
= 0.26418 gallons (US) per minute
= 0.003666 gallons (imp) per minute

liters per second = 0.001 cubic meters per second
= 0.06 cubic meters per minute
= 3.6 cubic meters per hour
= 60 liters per minute
= 15.85 gallons (US) per minute
= 13.2 gallons (imp) per minute

pounds of water per minute at 60°F = 7.5667 cubic centimeters per second
= 0.0002675 cubic feet per second
= 0.00045398 cubic meters per minute
= 0.0075599 kilograms per second

standard cubic feet per minute = 1.6957 cubic meters per hour at STP
= 0.47103 liters per second at STP

stokes = 0.001076 square feet per second
= 0.0001 square meters per second

tons (short) of water per 24 hours at 60°F = 1.338 cubic feet per hour
= 0.03789 cubic meters per hour
= 0.1668 gallons (US) per minute
= 83.333 pounds of water per hour

FORCE

dynes = 0.00001 newtons

grams-force = 0.0098066 newtons

kilograms-force = 9.8066 newtons
= 2.2046 pounds-force

kilopounds = 9.807 newtons
= 1 kilograms-force
= 2.2046 pounds-force
= 70.932 poundals
= 0.002205 kips

kips = 4448 newtons
= 453.6 kilograms-force
= 1000 pounds-force
= 32174 poundal
= 453.6 kilopond

grams-force per centimeter = 98.07 newtons per meter
= 0.0056 pounds-force per inch

kilograms-force per meter = 9.8066 newtons
= 0.6721 pounds-force per foot

newtons = 100000 dynes
= 0.10197 kilograms-force
= 7.233 poundals
= 0.2248 pounds-force

poundals = 0.13826 newtons

pounds-force = 4.448 newtons