HHE 2022-2023

FROM OLD UNIT TO SI UNIT CONVERSION LENGTH Inch (in) Millimetres (mm) x25.4 n/16 inch Millimetres (mm) x1.6 Foot (ft) Metres (m) x0.305 mile (mi) Kilometres (km) x1.609 MASS Pound (lb) Kilogramme (kg) x0.454 Ounce (oz) Gramme (g) x28.04 Long Ton (UK) Tonne (t) x1.02 Short Ton (USA) Tonne (t) x0.91 FORCE (WEIGHT) Pound-force (lbf) Newton (N) x9 then ÷2 PRESSURE lbf/in 2 (psi) Bar ÷14.5 Bar Kilopascal (kPa) x100 lbf/in 2 (psi) Kilopascal (kPa) x6.9 kgf/cm 2 or kp/cm 2 Bar x0.98 Atmosphere (standard) Bar x1.013 Inches Water Gauge (inH 2 0) Millibar (mbar) x2.49 Millimetres of Mercury (mmHg) (Torr) Millibar (mbar) x1.33 Tons/in 2 Bar x154 TORQUE Foot Pound Force (lbf ft) Newton-Metre (N m) x1.36 VOLUME Gallon (UK) (gal) Litre (L) x4.54 Gallon (USA) (gal) Litre (L) x3.79 Pint (UK) (pt) Litre (L) x0.57 Pint (USA) (pt) Litre (L) x0.47 Fluid Ounce (UK) (fl oz) Cubic Centimetre (cm 3 ) x28.4 Fluid Ounce (USA) (fl oz) Cubic Centimetre (cm 3 ) x29.6 FLOW Cubic Feet Per Minute (cfm) Cubic Decimetres/Second (dm 3 /s) (ltrs/sec) x0.472 Cubic Feet Per Minute (cfm) Cubic Metres/Second (m 3 /s) x0.472 then ÷1000 Cubic Feet Per Minute (cfm) Cubic Decimetres/Minute (dm 3 /s) (ltrs/min) x28.32 POWER Horsepower (hp) Watt (W) x746 Horsepower (hp) Kilowatt (kW) x0.746 ENERGY, WORK Foot-Pound-Force (ft lbf) Joule (J) x1.35 Kilogramme-Force Metres (kgf m) Joule (J) x9.807 British Thermal Unit (Btu) Joule (J) x1055 TEMPERATURE Fahrenheit (°F) Celsius (°C) +40 then x5 then ÷9 then -40 Conversion Factors