Technical handbook IV (UK) Unit of United Kingdom (US) Unit of USA Conversion chart Conversion chart Unit Base unit Conversion unit Factor Length 1 inch in mm 25.4 1 milllimetre mm in 0.03934 1 foot ft m 0.3048 1 metre m ft 3.28084 Area 1 square inch sq in cm² 6.4516 1 square centimetre cm² sq in 0.1550 Volume 1 gallon (UK) gal l 4.54596 1 litre l gal (UK) 0.219976 1 gallon (US) gal l 3.78533 1 litre l gal (US) 0.264177 Weight 1 pound lb kg 0.453592 1 kilogramme kg lb 2.204622 Torque 1 pound foot lb • ft N • m 1.488164 1 Newton metre N • m lb • ft 0.671969 Pressure 1 pound per square inch psi bar 0.06895 1 bar bar psi 14.5035 1 pound per square inch psi MPa 0.006895 1 mega pascal MPa psi 145.035 1 kilo pascal kPa bar 0.01 1 bar bar kPa 100 1 mega pascal MPa bar 10 1 bar bar MPa 0.1 Velocity 1 foot per second ft / s m / s 0.3048 1 metre per second m / s ft / s 3.28084 Flow rate 1 gallon per minute (UK) gal / min. l / min. 4.54596 1 litre per minute l / min. gal / min. (UK) 0.219976 1 gallon per minute (US) gal / min. l / min. 3.78533 1 litre per minute l / min. gal / min. (US) 0.264178 Temperature Fahrenheit degree °F °C 5/9 • (°F-32) Celsius degree °C °F °C • (9/5) +32
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