12 KNOWLEDGE Quantities and units Quantity Legal units Units no longer approved Conversion factors/ Relationships Comments Name Symbol Name Symbol activity of a radioactive substance becquerel Bq Curie Ci 1 Bq 1 Ci = 1 s-1 = 3,7 · 1010 s-1 SI unit equivalent dosage sievert Sv Rem rem 1 Sv 1 rem = 1 J/kg = 10-2 J/kg SI unit work, mechanical joule J Erg erg 1 J 1 erg = 1 N · m= 1 kg · m2/s2 = 10-7 J SI unit luminous intensity lux lx Nox nx 1 lx 1 nx = 1 lm/m2 = 10-3 lx SI unit lens power of optical systems diopter dpt 1 dpt = 1 m-1 (also called refractive power density kilogram divided by cubic meter kg/m3 SI unit usually expressed in g/ml or g/cm3 rotation, specific rad · m2/kg degree · dm–1 · g–1 · ml degree [a] d l c = a / (l · c) = amount of rotation in degrees = polarimeter tube length in dm = concentration in g/ml SI unit usually expressed in degrees amount of rotation caused by 1 g substance in 1 ml solution in a tube 10 cm long) rotational speed rotations divided by seconds rotations divided by minutes s–1 min–1 RPM 1 RPM = 1 min–1 = 1/60 s–1 = 1/60 Hz SI unit pressure Pascal Bar Pa bar phys. atmosph. techn. atmosph. techn. atmosph. above atm meter water gage millimeter mercury or torr atm at atü mWG mm Hg torr 1 Pa 1 bar 1 atm 1 at atü 1 mWG 1 mm Hg = 1 N/m2 = 105 Pa = 1,01325 · 105 Pa = 1 kp/cm2 = 0,9807 · 105 Pa = atm + 1 = 9,790 · 103 Pa = 1 Torr = 1,3332 · 102 Pa SI unit also refer to tables “Conversion factors for units of pressure“ and “Conversion of English to metric units energy joule electron volt J eV calory cal 1 J 1 eV 1 cal = 1 N · m = 1 kg · m2/s = 1 W · s = 1,60219 · 10-19 J = 4,1868 J SI units absorbed dose Gray Gy Rad Rem rd rem 1 Gy 1 rd 1 rem = 1 J/kg = 0,01 J/kg = 0,01 J/kg SI unit absorbed dosage rate/power Gray divided by second Gy/s 1 Gy/s = 1 W/kg SI unit extinction coefficient, molarer specific l/mol · cm l/g · cm also called spectral absorption factor (DIN) or internal absorbency (IUPAC)
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