Table B-1. UNITS OF MEASURE

TM 750-245-4

TABLE B-1 (Continued}

Cubic Measure

1 cu centimeter

0.061 cu inch

1 cu inch = 16.39 cu cm

1 cu meter

1.308 cu yds

35.316 cu feet

1 gallon (U.S.)

231 cubic inches

1 cu foot

7.48 gallons

1 liter

1000 cu cm

Time

1 day = 86,400 seconds

1 year = 8760 hours (approx.)

Mass

1 slug

32.2 pounds mass

14,606 kilograms

1 pound mass

453.6 grams

Force

1 pound force

11 slug

X 1 foot / sec / sec

1 dyne

1 gram

X 1 centimeter / sec / sec

1 newton

1 kilogram

X 1 meter / sec / sec

1 pound force

4.452 newtons

1 newton

100,000 dynes

0.224 pounds force

1 gram force

980.6 dynes

Pressure

1 atmosphere

14.69 pounds/sq inch=29.92 in of Hg

1 atmosphere

76 cm of Hg=33.9 ft of water

1 in Hg

0.491 pounds/sq inch

Water pressure pounds/sq inch

head in ft x 0.434

Work and Energy - Mechanical

1 erg

1 dyne X 1 centimeter

1 newton X 1 meter = 105 dynes x 102 cm = 107 ergs

1 joule

1 ft lb

1 pound force X 1 foot = 1.356 joules

Work and Energy - Heat Equivalent

1 Btu raises 1 pound of water 10

1 gram calorie raises 1 gram of water 10

1 Btu = 252 gram calories = 778 ft lb = 1055 joules

1 gram calorie = 0.003964 Btu = 4.184 joules

1 horsepower hour = 2544 Btu

Work and Energy - Electrical Equivalent

1 joule = 1 watt X 1 second = 1 amp (dc) X 1 volt (dc) X 1 sec

W (joules) = L (henries) X 1 (amperes)

W (joules) = C (farads) X E (volts)2

1 kilowatt hour

3,600,000 joules

Power

1 watt - 1 joule/ sec

1 horsepower - 550 ft lb/ sec - 746 watts

1 watt - 3.412 Btu / hr = 0.239 gram calorie/ sec

P (watts) -R (ohms) X 1 (amperes)

R (ohms)

E (volts)

P (watts)

B-16