length

1 km=0.621 miles 1 meter=3.281 feet=1.094 yards 1 cm=0.394 inches

1 mile=1.609 km 1 foot=0.3048 m 1 inch=2.54 cm

1 nautical mile=1.852 kilometers 1 yard=0.9144 meters 1 foot=12 inches

1 yard=3 feet 1 mile=5280 feet 1 mile=1.1516 miles

quality

1 ton (t)=1000 kg=2205 lb=

1.102 short ton (sh.ton)=0.934 long ton (kg) 1 kg=2.205 lb 1 short ton (sh.ton)=0.907 t=2000 lb (1b)

1 long ton=1.016 ton 1 lb=0.454 kg 1 oz=28.350 g

density

1 kg/m3=0.001 g/cm3 (g/cm3)=0.0624 lb/ft3 (lb/ft3) 1 lb/ft3 (lb/ft3)=16.02 kg/m3 (kg/m3) 1 lb/inch3 (lb/in3)=27679.9 kg/m3 (kg/m3)

1 lb/gal=119826 kg/m3 1 lb/gal=99.776 kg/m3 1 lb/bbl=2.853 kg/m3

1 Baume density=specific gravity at 140/15.5 ℃ - 130 API=specific gravity at 141.5/15.5 ℃ - 131.5

pressure

1 MPa=145 lb/in2 (psi)

=10.2 kg/cm2=10 bar=9.8 atmospheric pressure (at m) 1 lb/inch2 (psi)=0.006895 MPa

=0.0703 kg/cm2 (kg/cm2)=

0.0689 bar=0.068 atmospheric pressure (at m) 1 bar=0.1 MPa=14.503 lb/in2 (psi)=1.097 kg/cm2 (kg/cm2)

=0.987 atmospheric pressure (at m)

1 atmospheric pressure (at m)=0.101325 MPa=14.696 lb/in2 (psi)

=1.0333 kg/cm2 (kg/cm2)

=1.0133 bar

the measure of area

1 square kilometer (km2)=100 hectares (ha)=247.1

Acre=0.386 square miles (mile2) 1 square meter (m2)=10.764 square feet (ft2) 1 acre=100 square meters (m2)

1 hectare (ha)=10000 square meters (m2)=2.471 acres (acre) 1 square mile (mile2)=2.590 square kilometers (km2) 1 acre=0.4047 hectares (ha)=40.47*

10-3 square kilometers (km2)=4047 square meters (m2)

1 square foot (ft2)=0.093 square meters (m2) 1 square inch (in2)=6.452 square centimeters (cm2) 1 square yard (yd2)=0.8361 square meters (m2)

volume

1 cubic meter (m3)=1000 liters (liter)

=35.315 cubic feet (ft3)=6.290 barrels (bbl) 1 cubic feet (ft3)=0.0283 cubic meters (m3)=28.317 liters (l) 1 thousand cubic feet (mcf)=28.317 cubic meters (m3)

1 million cubic feet (MMcf)=283.17 million cubic meters (m3) 1 billion cubic feet (bcf)=28.317 million cubic meters (m3) 1 trillion cubic feet (tcf)=28.317 billion cubic meters (m3)

1 cubic inch (in3)=16.3871 cubic centimeter (cm3) 1 acre · foot=1234 cubic meters (m3) 1 barrel (bbl)=0.159 cubic meters (m3)=42 U.S. gallons (gal)

1 US gallon (gal)=3.785 L (l) 1 US quart (qt)=0.946 L (l) 1 US pint (pt)=0.473 L (l)

1 megel (gi)=0.118 liters (l) 1 English gallon (gal)=4.546 liters (l)

power

1 kgf · m/s

=9.80665 W 1 metric hp=735.499 W 1 cal/s=4.1868 W

1 Btu/h=0.293071 W

speed

1 ft/s=0.3048 m/s 1 mile/h=0.44704 m/s

permeability 

1 Darcy=1000 millidarcy 1 square centimeter (cm2)=9.81 * 107 Darcy

Kinematic viscosity

1 ft2/s=9.29030 * 10-2

Meter 2/second (m2/s) 1 s (St)=10-4 meter 2/second (m2/s) 1 centisecond (eSt)=10-6 meter 2/second (m2/s)=1 millimeter 2/second (mm2/s)

Dynamic viscosity

1 poise (P)=0.1 Pa · s 1 centipoise (cP)=10-3 Pa · s 1 kgf/m2=9.80505 Pa · s

1 lbf/s/ft2 (1bf · s/ft2)=

47.8803 Pa · s

power

1 N=0.225 lbf=0.102 kgf 1 kgf=9.81 N 1 lbf=4.45 N

1 dyn=10-5 N

temperature

K (Kelvin)=5/9 (℉+459.67) K=℃+273.15 n ℉=[(n-32) * 5/9] ℃

N ° C=(5/9 · n+32) ° F 1 ° F=5/9 ° C (temperature difference)

Heat transfer coefficient

1 kcal (m2 · h · ℃) [kcal/

(m2 · h · ℃)]=1.6279 W/(m2 · Kelvin) [W (m2 · K)] 1 BTU/(ft2 · h · F)

[Btu/(ft2 · h · ℉)]=5.67826 W/(m2 · Kelvin) [W (m2 · K)] 1 m2 · h · ℃/kcal (m2 · h · ℃/kcal)

=0.86000 m2 · Kelvin/watt (m2 · K/W)

1 kcal (m2 · h) (kcal/m2 · h)

=1.16279 W/m2

Thermal conductivity

1 kcal (m2 · h · ℃) [kcal/(m2 · h · ℃)]=1.16279 W/(m · K) [W (m · K)] 1 BTU/(ft2 · h · ℉) [Btu/(ft2 · h · ℉)]

=1.7303 W/(m · K)

Specific heat

1 kcal/(kg · ℃) [kcal/(kg · ℃)]=1 Btu/(lb · ℉) [Btu/(lb · ℉)]=4186.8 joules/(kg · Kelvin) [J/(kg · K)]

thermal power

1 joule=0.10204 kg · m=2.778 * 10-7 kW · h=3.777 * 10-7 metric hp h=3.723 * 10-7 British hp h=2.389 * 10-4 kcal=9.48 * 10-4 British thermal unit 1 cal=4.1868 joules (J) 1 British thermal unit (Btu)=1055.06 joules (J)

1 kilogram force meter (kgf · m)=9.80665 joules (J) 1 foot pound force (ft · 1bt)=1.35582 joules (J) 1 metric horsepower hour (hp · h)=2.64779 * 106 joules (J)

1 British horsepower hour (UKHp · h)

=2.68452 * 106 joules (J) 1 kilowatt hour (kw · h)=3.6 * 106 joules (J) 1 kcal=4186.75 joules (J)