1. surface area conversion:

1 square kilometer = 100 hectare =247. 1 acre =0.386 square mile.

1 m2 = 10.764 square foot

1 square inch =6.452 square centimeters.

1 hectare =10000m2 = 2.47 1 acre.

1 mu) =0.4047 hectares (ha)=4.047× 10-3 square kilometers (km2) = 4,047 square meters (m2).

1 mu) =0.4047 hectares (ha)=4.047× 10-3 square kilometers (km2) = 4,047 square meters (m2).

1 square foot = 0.093m2.

1 m2 = 10.764 square foot

1 square yard (yd2)=0.836 1 square meter (m2)

1 square mile (2 miles) =2.590 square kilometers (square kilometers)

2. Volume conversion

1 Meguiar's (gi)=0. 1 18 liters (1) 1 American product removal (pt)=0.473 liters (1).

1 Qt)= 0.946 L( 1) 1 gal)= 3.785 L( 1)。

1 barrel = 0. 159 cubic meters) =42 US gallons 1 acre foot = 1234 cubic meters.

1 cubic inch (in3) = 16.5438+0 cubic centimeter (cm3) 1 gallon (gal)=4.546 liters (1).

1 100 million cubic feet (BCF) = 2831.700 million cubic meters (m3) 1 trillion cubic feet (TCF) = 2831.700 million cubic meters (m3).

1 ten thousand cubic feet (mmcf) = 2.8310.7 million cubic meters (m3) 1 thousand cubic feet (mcf)= 28.35438+0.7 cubic meters (m3).

1 cubic foot =0.0283 cubic meter =28.3 17 liter (liter)

1 m3 =1000L (L) =35.3 15 cubic feet =6.29 barrels (barrels)

3. Length conversion

1 km (km)=0.62 1 mile (m)=3.28 1 foot (ft)= 1.094 yards (yd).

1 cm) =0.394 inch (inch) 1 inch (inch) =2.54 cm.

1 nautical mile = 1 .852km1fathom (FM) =1.829m.

1 yard =3 feet 1 rod (radian) = 16.5 feet

1 mile = 1.609 km 1 foot = 12 inch

1 mile) = 5280ft 1 nautical mile = 1. 15 16 mile.

4. Quantity conversion

1 long ton) = 1.0 16+06 ton (t) 1 kg) =2.205 lbs.

1 lb) = 0.454kg) [constant] 1 oz) =28.350 (g)

1 short ton =0.907 ton =2000 lbs.

1 ton (t)= 1000 kg)=2205 lb =1.102 short ton (sh.ton)=0.984 long ton.

5. Density conversion

1 pound/cubic foot =16.02kg/m3 (kg/m3)

Specific gravity at API =141.5/15.5℃-131.5.

1 lb/gallon = 99.776 kg/m3 (kg/m3)

Specific gravity at 1 Baume (b) =140/15.5℃-130.

1 pound/cubic inch = 27679.9 kg/cubic meter (kg/cubic meter)

1 lb/gallon = 1 19.826 kg/m3 (kg/m3)

1 lb/barrel = 2.853kg/m3 (kg/m3)

1 kg/m3 (kg/m3) = 0.00 1 g/cm3 (g/cm3) = 0.0624 lb/cm3.

6. Conversion of dynamic viscosity

1 sec (sec) = 10-4 m2/sec (m2/sec) = 1 cm2/sec (cm2/sec)

1 sq ft/sec = 9.29030× 10-2 m2/sec (m2/sec)

1 cm (cm) = 10-6 m2/s (m2/s) = 1 m2/s (mm2/s)

7. Dynamic viscosity conversion

Dynamic viscosity 1 poise (P) = 0. 1 pasec 1 centipoise (cP)= 10-3 pasec.

1 lb/sq ft = 47.8803 pa/sec.

1 kgf/m2 (kgf sec, m2) =9.80665 pa sec.

8. Force conversion

1 Newton (n) = 0.225 lbf = 0. 102 kgf.

1 kgf = 9.8 1 N。

1 lbf) = 4.45n 1 dyne =10-5n.

9. Temperature conversion

K = 5/9(F+459.67)K = 273. 15℃

n℃=(5/9 n+32) F n F=[(n-32)×5/9]℃

1 Fahrenheit = 5/9 degrees Celsius (temperature difference)

10. Pressure conversion

Pressure 1 bar = 1 05pa1dyne/cm2 = 0.1pa.

1 torr = 1 33.322pa1mmhg =133.322pa.

1 mm water column (mmH2O)= 9.80665 kPa1engineering atmospheric pressure = 98.0665 kPa.

1 kPa = 0. 145 psi = 0.0 102 kgf/cm2 = 0.0098 atm.

1 psi = 6.895 kPa) =0.0703 kgf/cm2 (kg/cm2) = 0.0689 bar.

=0.068 atm

1 physical atmospheric pressure =101.325kpa =14.696psi =1.0333bar.

1 1. Calculation of heat transfer coefficient

1 kcal/m2 h = 1. 16279 W/ m2 (W/m2).

1 kcal/(m 2 h ℃) [1 kcal/(m 2 h ℃)] = 1. 16279 W/ (m 2 Kelvin) [w/ (m 2 k)]

1 British thermal unit/(ft 2 h f) [btu/(ft 2 h f)] = 5.67826 w/(m 2 kelvin) [(W/ m 2 k)].

1 m 2 c/kcal (m 2 h c/kcal) = 0.86000 m 2 kelvin/watt (m 2 kw)

12. Thermal conductivity conversion

1 kcal (m h c) [kcal/(m h c)] =1.16279W/(m kelvin) [w/(m k)]

1 British thermal unit/(feet Fahrenheit) [but/ (feet Fahrenheit) =1.7303W/(meters Kelvin) [w/ (meters K)].

13. specific heat conversion

1 kcal/(kg℃) [kcal/(kg ℃)] = 1 British thermal unit/(lb. Fahrenheit) [British thermal unit/(lb. Fahrenheit)]

= 4 186.8 Joule/(kg Kelvin) [Joule/(kg Kelvin)]

14. Thermal energy conversion

1 card = 4. 1868 joules (joules)

1 kg force meter) =9.80665 Joule (Joule)

1 btu =1055.06 joules

1 kwh (kwh) = 3.6× 106 joules (joules)

1 ft lb force = 1.35582 joules (joules)

1 meter horsepower hour (horsepower hour) = horsepower hour) =2.64779× 106 joules (joules)

1 horsepower h = 2.68452× 106 joules.

1 joule = 0. 10204 kg m.

= 2.778× 10-7 kwh

= 3.777× 10-7 metric horsepower hours

= 3.723× 10-7 British horsepower hours

= 2.389× 10-4 kcal

= 9.48× 10-4 British thermal units

15. Working rate conversion

1 btu/hour = 0.29 1 watt

1 kg force m/s = 9.80665 watts.

1 card/second (card/second) = 4.1868W (horsepower) = 735.499W (horsepower).

16. Rate conversion

1 mile/hour =0.44704 m/s

1 ft/sec = 0.3048m/sec.

17. Permeability conversion

1 Darcy = 1000 millidarcy 1 cm2 = 9.81×107 Darcy.

18. geothermal gradient transformation

1 Fahrenheit/100 feet = 1.8 degrees Celsius/100 meters (℃/meter)

1℃/ km = 2.9 F/mile = 0.055 F/100 F/ft.

19. oil and gas production conversion

1 barrel = 0. 14 ton (crude oil, global average)

1 trillion cubic feet per day (TCFD)= 283.2 billion cubic meters per day (m3/d)= 1.336 trillion cubic meters per year (m3/a)

/kloc-0.00 billion cubic feet per day (BCFD) = 2832 million cubic meters per day (m3/d m3/d) = 103.36 million cubic meters per year (m3/a)

1 ten thousand cubic feet per day (mmcfd) = 283200 cubic meters per day (m3/d) =10,335,500 cubic meters per year (m3/a).

1000 cubic feet per day (Mcfd)=28.32 cubic meters per day (m3/d) = 1336 million cubic meters per year (m3/a)

1 barrel/day (bpd)=50 tons/year (crude oil, global average)

1 ton =7.3 barrels (crude oil, global average)

20. Oil-gas ratio conversion

1 cubic foot/barrel (cubic foot/barrel) =0.2067 cubic meter/ton (cubic meter/ton)

2 1. calorific value conversion

1 barrel of crude oil = 5.8× 106 British thermal unit (Btu).

1 ton coal =2.406× 107 British thermal unit (Btu).

1 m3 moisture = 3.909× 104 British thermal units (Btu).

1 kwh hydropower = 1.0235× 104 British heat (Btu)

1 m3 dry gas = 3.577× 104 British thermal unit (Btu) (the above is the average calorific value of the United States of America 1990).

22. Thermal equivalent conversion

1 barrel of crude oil = 5800 cubic feet of natural gas (calculated by average calorific value)

1 m3 natural gas =1.3300kg standard coal.

1kg crude oil = 1.4286kg standard coal.