Chapter 6 Quantities, units and symbols - Atlas Copco ...

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142 Multiple units. A multiple unit is formed by an SI unit or an additional unit by the unit being preceded by a prefix that involves the multiplication by the power of ten. Fourteen such prefixes are stated in international recommendations (standards) as set out in the table below. Prefix Power Designation Symbol Example 10 12 tera T 1 terajoule 1 TJ 10 9 giga G 1 gigawatt 1 GW 10 6 mega M 1 megavolt 1 MV 10 3 kilo k 1 kilometre 1 km 10 2 hectoh h 1 hectogram 1 hg 10 1 deca da 1 decalumen 1 dalm 10 –1 deci d 1 decimetre 1 dm 10 –2 centi c 1 centimetre 1 cm 10 –3 milli m 1 milligram 1 mg 10 –6 micro µ 1 micrometre 1 µm 10 –9 nano n 1 nanohenry 1 nH 10 –12 pico p 1 picofarad 1 pF 10 –15 femto f 1 femtometre 1 fm 10 –18 atto a 1 attosecond 1 as Pressure Pa=N/m 2 bar kp/cm 2 Torr m vp mm vp 1 10 –5 1.02 x 10 –5 7.5 x 10 –3 1.02 x 10 –4 0.102 10 5 1 1.02 750 10.2 1.02 x 10 4 9.81 x 10 4 0.981 1 735 10 10 4 133,3 1.33 x 10 –3 1.36 x 10 –3 1 1.36 x 10 –2 13,6 9.81 x 10 3 9.81 x 10 –2 0.1 73.5 1 10 3 9.81 9.81 x 10 –5 10 –4 7.35 x 10 –2 10 –3 1 Energy J kJ kWh kpm kcal 1 10 –3 2.78 x 10 –7 0.102 2.39 x 10 –4 1000 1 2.78 x 10 –4 102 0.239 3.6 x 10 6 3.6 x 10 3 1 3.67 x 10 5 860 9.81 9.81 x 10 –3 2.72 x 10 –6 1 2.39 x 10 –3 4.19 x 10 3 4.19 1.16 x 10 –3 427 1 Power W kpm/s kcal/s kcal/h hk 1 0.102 0.239 x 10 –3 0.860 1.36 x 10 –3 9.81 1 2.34 x 10 –3 8.43 1.33 x 10 –2 4.19 x 10 3 427 1 3.6 x 10 3 5.69 1.163 0.119 0.278 x 10 –3 1 1.58 x 10 –3 735 75 0.176 632 1
6.2 Drawing symbols Air filter Silencer Diffusor Compensator Damper valve Screw compressor Non-return valve Stop valve Safety valve Manual valve Pressure closing valve Pressure opening valve Oil separator Ejector Water cooled cooler Water separator Condensation receiver Direction of flow Air cooled cooler Fan Expansion vessel Minimum pressure valve Thermostat valve Thermostat valve 143
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Chapter 6 Quantities, units and symbols - Atlas Copco ...

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