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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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