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The State of Canada's Environment — 1996

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Units of Measure

Quantity  Symbol  Unit name

Concentration
   ppm:  part per million
   ppmv:  part per million by volume
   ppmdv:  part per million dry volume

   ppb:  part per billion
   ppbv:  part per billion by volume

   ppt:  part per trillion
   pptv:  part per trillion by volume

   ng/m³:  nanogram per cubic metre
   µg/m³:  microgram per cubic metre

   mg/m³:  milligram per cubic metre
   µg/dL:  microgram per decilitre
   mg/L:  milligram per litre

   ng/g:  nanogram per gram
   µg/g:  microgram per gram

   mg/kg:  milligram per kilogram

   µEq/L:  microequivalent per litre

   DU:  Dobson Unit; 100 DU equals an imaginary
     layer of pure ozone gas 1 mm thick at
     standard sea level temperature and pressure

Equivalents: a) Liquids: 1 mg/L = 1 ppm    b) Solids: 1 mg/kg = 1 ppm
1 µg/L = 1 ppb   1 µg/kg = 1 ppb
     1 ng/kg = 1 ppt

Flow
   m³/s:  cubic metre per second
   kg/d:  kilogram per day
   t/d:  tonne per day

Energy
   Btu:  British thermal unit
   MJ:  megajoule
   GJ:  gigajoule
   PJ:  petajoule
   EJ:  exajoule

   MW:  megawatt
   KW-h:  kilowatt-hour
   TW-h:  terawatt-hour

   KV:  kilovolt
   W/m²:  watt per square metre

Quantity  Symbol  Unit Name

Length
   nm:  nanometre
   µm:  micrometre
   mm:  millimetre
   cm:  centimetre
   m:  metre
   km:  kilometre

Weight
   ng:  nanogram
   µg:  microgram
   mg:  milligram
   g:  gram
   kg:  kilogram

   t:  tonne
   kt:  kilotonne
   Mt:  megatonne

Pressure
   kPa:  kilopascal

Radiation
   Bq:  becquerel
   Bq/m²:  Becquerel per square metre
   Bq/kg:  Becquerel per kilogram

   mSv:  millisievert

Area
   ha:  hectare
   km²:  square kilometer

Time
   s:  second
   h:  hour

Volume
   mL:  millilitre
   L:  litre

   dam³:  decametre cube
   m³:  metre cube

SI Prefixes
Prefix  Symbol  Multiplying Factor

exa  E:  1018 (1 000 000 000 000 000 000)
peta  P:  1015 (1 000 000 000 000 000)
tera  T:  1012 (1 000 000 000 000)
giga  G:  109 (1 000 000 000)
mega  M:  106 (1 000 000)
kilo  K:  103 (1 000)
hecto  h:  102 (100)
deca  da:  101 (10)
deci  d:  10-1 (0,1)
centi  c:  10-2 (0,01)
milli  m:  10-3 (0,001)
micro  µ:  10-6 (0,000 001)
nano  n:  10-9 (0,000 000 001)
pico  p:  10-12 (0,000 000 000 001)
femto  f:  10-15 (0,000 000 000 000 001)


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