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# Unit Conversions

## Unit Conversions

LENGTH

km = Kilometer

m = Meter

• cm = centimeter
• 1 km = 1000 m
• 1 m = 100 cm
• 1 cm = 0.01 m = 10-2m
• 1 mm = 10-3 m
• 1µm = 10-6 m
• 1 mµ = 1 nm = 10-9 m
• a angstrom (A) = 10-10 m
• 1 inch (in) = 2.54 cm
• 1 foot (ft) = 30.48 cm
• 1 cm = 0.3937 in
• 1 m = 39.37 in
• 1 Km = 0.6214 mi (mile)
• 1 yard = 0.9144 m
• 1.6 m = 5.24 ft
• 1.8 m = 5.9 ft
• 1 mile = 1.6.9 Km
• 1 nautical mile (NM) = 1.852 Km

 10-1 m dm decimeter 101 m dam decameter 10-2 m cm centimeter 102 m hm hectometer 10-3 m mm millimeter 103 m km kilometer 10-6 m μm micrometer 106 m Mm megameter 10-9 m nm nanometer 109 m Gm gigameter 10-12 m pm picometer 1012 m Tm terameter 10-15 m fm femtometer 1015 m Pm petameter 10-18 m am attometer 1018 m Em exameter 10-21 m zm zeptometer 1021 m Zm zettameter 10-24 m ym yoctometer 1024 m Ym yottameter

VOLUME

• 1 liter(l) = 1000 cm3 = 1.057 quart(qt) = 61.02 in3 = 0.03532 ft3
• 1 m3 = 1000 l = 35.32 ft
• 1 ft3 = 7.481 U.S. gal = 0.02832 m3 = 2832 l
• 1 U.S. gallon(gal) = 231 in3 = 3.785 l

TIME

• 1  hour = 60 minutes = 3600 seconds
• 1 day = 24 hours
• 1 month ≈ 30 days
• 1 year ≈ 365 days ≈ 52 weeks = 12 months

MASS

• 1 ton = 1000 kg
• 1 Kilogram (kg) = 2.2 pounds (lb) = 0.0685 slug
• 1 lb = 453.6 gm = 0.031 slug
• 1 slug = 32.174 lb = 14.59 kg
• 1 lb = 16 ounce (oz)
• 1 troy ounce = 31.1034768 gram

table SI Unit

SPEED

• Km/h =Kilometer per hour
• 1 km/h = 0.2778 m/sec = 0.6214 mi/h = 0.9113 ft/sec
• 1 mi/h = 1.609 Km/h = 1.467 ft/sec = 0.4470 m/sec
• 1 knot = 1 nautical mile / hour = 1.852 km/h

DENSITY

1 lb/ft3 = 0.01602 gm/cm3
1 slug/ft3 = 0.5154 gm/cm3
1 gm/cm3 = 103 kg/m3 = 62.43 lb/ft3

FORCE

1 long ton = 2240 lbwt
1 metric ton = 2205 lbwt
1 newton(nt) = 105 dynes = 0.1020 kgwt = 0.5548 lbwt
1 pound weight (lbwt) = 4.448nt = 0.4536 kgwt = 32.17 poundals
1 kilogram weight (kgwt) = 2.205 lbwt = 9.807 nt

TEMPERATURE

0o = 32o F = 273 K
20o C = 68o F

ENERGY

1 electron volt (ev) = 1.602 x 10-19 joule
1 Kilowatt hour (kw hr) = 3.60 x 106 joules = 860.0 kcal = 3413 Btu
1Btu (British thermal unit) = 778 ft lbwt = 1055 joules = 0.293 watt hr
1 joule = 1 ny m = 107 ergs = 0.7376 ft lbwt = 0.2389 cal = 9.481 x 10-4 Btu
1 ft lbwt = 1.356 joules = 0.3239 cal = 1.285 x 10-3 Btu

PRESSURE

1 nt/m2 = 10dynes/cm2 = 90869 x 10-6 atmosphere = 2.089 x 10-2 lbwt/ft2
1 atm = 1.013 x 105 nt/m2
= 1.013 x 106 dynes/cm2
1470 lbwt/in2
76 cm mercury
= 406.8 in water

1 lbwt/in2 = 6895 nt/m2 = 5.171 cm mercury
= 27.68 in water

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