Book - School of Science and Technology

Appendix IISI unit symbolsQuantity Unit SymbolCommonmultiples orsub-multiples Multiplier SymbolLength metre m kilometre m 10 3 kmmillimetre m 10 3 mmArea square metre m 2 hectare m 2 10 5 hasq. millimetre m 2 10 9 mm 2Volume cubic metre m 3 litre m 3 10 3 (litre)*cu. millimetre m 3 10 9 mm 3Time second s hour s 3600 hVelocity metre per second m/sAcceleration metre/sec 2 m/s 2Frequency hertz (cycle per sec) HzRotational frequency revolutionsper sec s 1Mass kilogram kg tonne kg 10 3 tgram kg 10 3 gmilligram kg 10 6 mgDensity (specific mass) kg/m 3Specific volumem 3 /kgMass flow ratekg/sVolume flow rate m 3 /slitre per second …m 3 =s†10 3 litre/sMomentumkg m/sForce newton N meganewton N 10 6 MNkilonewton N 10 3 kNTorqueNmPressure (and stress) pascal Pa megapascal Pa 10 6 MPakilopascal Pa 10 3 kPabar Pa 10 5 bmillibar Pa 10 2 mbViscosityDynamicpascal second Pa s centipoise Pa s 10 3 cPKinematic centimetre 2 /sec cm 2 /scentistoke …cm 2 =s†10 2 cStTemperature Kelvin Kdegree Celsius CHeatEnergy gigajoule J 10gGJWork joule J megajoule J 10 6 MJQuantity of heat kilojoule J 10 3 kJHeat flow rate (power) watt W gigawatt W 10 9 GWmegawatt W 10 6 MWkilowatt W 10 3 kWThermal conductivityW/m KThermal resistivitymK/WSpecific heat capacitykJ/kg KLatent heatkJ/kg*Thisbook doesnot use l asa symbol for litre.