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Northern River Basins Study Final Report Units of Measure 1 tonne (metric tonne)= 106 g= 1000 kg 1 kg (kilogram)= 103 g= 1000 g 1 g (gram)= 1 g= 1000 mg 1 mg (milligram)= 10-3 g= 1000 µg 1 µg (microgram)= 10-6 g= 1000 ng 1 ng (nanogram)= 10-9 g= 1000 pg 1 pg (picogram)= 10-12 g= 1000 fg 1 fg (femtogram)= 10-15 g= 1000 ag 1 ag (attogram)= 10-16 g Approximate Equivalents 1 part in 1,000 parts = 1 g/L= 1 g/kg= 10-3 g/g = 1 part per thousand 1 mg/L= 1 mg/kg= 10-6 g/g = 1 part per million 1 µg/L= 1 µg/kg= 10-9 g/g = 1 part per  billion 1 ng/L= 1 ng/kg= 10-12 g/g = 1 part per trillion 1 pg/L= 1 pg/kg= 10-15 g/g = 1 part per quadrillion 1 L of water= 1 kg at 4oC 1 m3 of water= 1000 L= approx. 1 tonne

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