# Commonly used units in the detection instrument conversion highlights

Area conversion

1 square kilometer ( km2 ) = 100 hectares ( ha ) = 247.1 acres ( acre ) = 0.386 square miles ( mile2 )

1 square meter ( m2 ) = 10.764 square feet ( ft2 )

1 square inch ( in2 ) = 6.452 square centimeters ( cm2 )

1 hectare ( ha ) = 10,000 square meters ( m2 ) = 2.471 acres ( acre )

1 acre ( acre ) = 0.4047 ha ( ha ) = 4.047 Ã— 10-3 sq km ( km2 ) = 4047 sqm ( m2 )

1 acre ( acre ) = 0.4047 ha ( ha ) = 4.047 Ã— 10-3 sq km ( km2 ) = 4047 sqm ( m2 )

1 square foot ( ft2 ) = 0.093 square meters (m2)

1 square meter ( m2 ) = 10.764 square feet ( ft2 )

1 square yard ( yd2 ) = 0.8361 square meters ( m2 )

1 square mile ( mile2 ) = 2.590 square kilometers ( km2 )

Length conversion

1 km ( km ) = 0.621 mile ( mile ) 1 meter ( m ) = 3.281 feet ( ft ) = 1.094 yards ( yd )

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

1 nmile ( mile ) = 1.852 km ( km ) 1 Yingxun ( fm ) = 1.829 ( m )

1 yard ( yd ) = 3 feet ( ft ) 1 rod ( rad ) = 16.5 feet ( ft )

1 mile = 1.609 km km 1 ft = 12 inches in

1 mile (mile) = 5280 feet (ft) 1 nautical miles (n mile) = 1.1516 miles (Mile)

Quality conversion

1 long ton = 1.016 tons (t ) 1 kg (kg ) = 2.205 pounds (lb )

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

1 short ton (sh.ton ) = 0.007 tons (t ) = 2000 pounds (lb )

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

Density conversion

1 lbs / ft 3 (lb / ft3) = 16.02 kg / m 3 (kg / m3)

API degree = specific gravity at 141.5/15.5 Â°C - 131.5

1 lbs / gal England (lb / gal) = 99.776 kg / m 3 (kg / m3)

1 Baume Density ( B ) = Specific Gravity at 140/15.5 Â°C - 130

1 lbs / inch 3 (lb / in3) = 27679.9 kg / m 3 (kg / m3)

1 lbs / US gallon (lb / gal) = 119.826 kg / m 3 (kg / m3)

1 lbs / (petroleum) barrel (lb / bbl) = 2.853 kg / m 3 (kg / m3)

1 kg / m 3 (kg / m3) = 0.001 g / cm 3 (g / cm3) = 0.0624 lbs / ft 3 (lb / ft3)

Force value conversion

1 Newton ( N ) = 0.225 pounds force ( lbf ) = 0,102 kilograms force ( kgf )

1 kg force ( kgf ) = 9.81 N ( N )

1 lbf ( lbf ) = 4.45 Newtons ( N ) 1 dyne ( dyn ) = 10-5 Newtons ( N )

Temperature conversion

K = 5/9 (Â° F+459.67 ) K= Â°C +273.15

n Â°C = (5/9 â€¢ n+32) Â° F n Â° F = [(n-32) Ã— 5/9] Â°C

1 Â° F = 5/9 Â°C (temperature difference)

Heat transfer coefficient conversion

1 kcal / m 2 â€¢ when (kcal / m2 â€¢ h) = 1.16279 W / m 2 (w / m2)

1 kcal / (m 2 â€¢ â€¢ â„ƒ) [1kcal / (m2 â€¢ h â€¢ â„ƒ ) ] = 1.16279 W / (m 2 â€¢ Kelvin) [w / (m2 â€¢ K)]

1 BTU / (ft 2 â€¢ â€¢ Â° F) [Btu / (ft2 â€¢ h â€¢ Â° F) ] = 5.67826 W / (m 2 â€¢ Kelvin) [(w / m2 â€¢ K)]

1 meter 2 â€¢ â€¢ â„ƒ / kcal (m2 â€¢ h â€¢ â„ƒ / kcal ) = 0.86000 yards 2 â€¢ Kelvin / watt (m2 â€¢ K / W)

Thermal conductivity conversion

1 kcal ( m Â· h â€¢ Â°C) [ kcal/(m â€¢ h â€¢ Â°C ) ] = 1.16279 watts / (m. Kelvin) [ W/(m â€¢ K) ]

1 BTU / (ftâ€¢hourâ€¢Â° F ) [ But/(ft â€¢ h â€¢Â° F) = 1.7303 W / (mâ€¢Kelvin) [ W/(m â€¢ K) ]

Specific heat conversion

1 kcal / (kilogramâ€¢Â°C)[ kcal/(kg â€¢Â°C ) ]= 1 BTU / (lbâ€¢Â° F )[ Btu/(lb â€¢Â° F) ]

= 4186.8 joules / (kg / Kelvin) [ J / ( kg â€¢ K )]

Heat work conversion

1 card ( cal ) = 4.1868 joules ( J ) 1 large card = 4186.75 joules ( J )

1 kg of force ( kgf â€¢ m ) = 9.80665 joules ( J )

1 British thermal unit ( Btu ) = 1055.06 joules ( J )

1 kWh ( kW â€¢ h ) = 3.6 Ã— 106 Joules ( J )

1 foot pounds force ( ft â€¢ lbf ) = 1.35582 joules ( J )

1 metric hp hour ( hp â€¢ h ) = 2.64779 Ã— 106 joules ( J )

1 hrh ( UKHp â€¢ h ) = 2.68452 Ã— 106 joules

1 Joule = 0.10204 kg â€¢ m

= 2.778 Ã— 10 - 7 kWh

= 3.777 x 10 - 7 metric hp hours

= 3.723 Ã— 10 - 7 inches of horsepower hours

= 2.389 Ã— 10 - 4 kcal

=9.48 x 10 - 4 BTUs

Power conversion

1 British thermal unit / hour ( Btu/h ) = 0.293071 watts ( W )

1 kgfm / s ( kgf â€¢ m/s ) = 9.80665W ( w )

1 card / second ( cal/s ) = 4.1868 watts ( W ) 1 metric horsepower ( hp ) = 735.499 watts ( W )

Speed â€‹â€‹conversion

1 mile / h (mile / h) = 0.44704 m / s (m / s)

1 foot / second ( ft/s ) = 0.3048 meters / second ( m/s )

Oil and gas production conversion

1 barrel ( bbl ) = 0.14 tons ( t ) (crude oil, global average)

1 trillion cubic feet per day ( tcfd ) = 28.32 billion cubic meters per day ( m3/d ) = 10.336 trillion cubic meters per year ( m3/a )

One billion cubic feet per day ( bcfd ) = 0.2832 billion cubic meters per day ( m3/d ) = 10.336 billion cubic meters per year ( m3/a )

1 million cubic feet per day ( MMcfd ) = 28,032 cubic meters per day ( m3/d ) = 10,335,500 cubic meters per year ( m3/a )

1 000 cubic feet / day ( Mcfd ) = 28.32 m3 / day ( m3/d ) = 10,336 thousand meters / year ( m3/a )

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

1 t ( t ) = 7.3 barrels ( bbl ) ( crude oil, global average )

A pressure of 1 bar (bar) = 100000 Pa (Pa) 1 dyne / cm 2 (dyn / cm2) = 0.1 Pa (Pa)

1 torr (Torr) = 133.322 Pa (Pa) 1 millimeters of mercury (mmHg) = 133.322 Pa (Pa)

1 mm water column ( mmH2O ) = 9.80665 Pa ( Pa ) 1 project atmospheric pressure = 98.0665 kPa ( kPa )

1 kilopascals (kPa) = 0.145 lbf / inch 2 (psi) = 0.0102 kgf / cm 2 (kgf / cm2)

=0.0098 atmosphere ( atm )

1 lbs / inch 2 (psi) = 6.895 kilopascals (kPa) = 0.0703 kgf / cm 2 (kg / cm2)

= 0.0689 bar ( bar ) = 0.068 atmosphere ( atm )

1 physical atmosphere (atm) = 101.325 kilopascals (kPa) = 14.696 lb / inch 2 (psi)

= 1.0333 bar ( bar )

Commonly used pressure measurement units and their identification symbols:

â–² MPa ( MPa ) ; kPa ( kPa ) ; Pa ( Pa )

â€» : The MPa sign of the pressure unit is MPa. Do not write it as Mpa mpa; The kPa sign kPa should not be written as KPa Kpa or kpa; The sign Pa should not be written as pa.

â–² pounds / inch 2 ( lbf/in2, psi )

â€» : Pound force / inch 2 in pressure units is lbf/in2, psi should not be written as Ibf/ln2 Psi;

â–² mmHg ( mmHg )

â€» : mmHg in millimeters of mercury in pressure units is not written in mmhg;

â–² Inches of mercury ( inHg )

â€» : The unit of pressure in inches of mercury is inHg not written inhg;

â–² mmH2O

â€» : The millimeter water column symbol of the pressure unit is mmH2O. Do not write it as mmh2O;

â–² inch water column ( inH2O )

â€» : The unit of pressure in inches of water is inH2O not written as inh2O;

â–² kgf / cm 2 (kgf / cm2)

â€»: the pressure unit kgf / cm 2 symbols kgf / cm2 is not written Kgf / cm2;

â–² Physical Atmosphere ( atm )

â€» : The symbol of physical pressure in pressure unit is atm not written as Atm;

â–² bar ( bar ) ; millibar ( mbar )

â€» : The pressure units of bar and millibar symbols are bar and mbar. Do not write Bar and mBar;

â— Torr

â€»: torr pressure unit symbol is not written as Torr torr.

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