# The Poison Paradox: Chemicals as Friends and Foes

By John Timbrell | Go to book overview

Units of Measurement
Weight
 ng nanogram 1 hundred millionth of a gram (0.000000001 g or 1 × 10-9 g) µg microgram 1 millionth of a gram (0.000001 g or 1 × 10-6 g) mg milligram 1 thousandth of a gram (0.001 g or 1 × 10-3 g) g gram 1 thousandth of a kilogram (0.001 kg or 1 × 10-3 kg) (28 g= approx. 1 oz) kg kilogram 1 thousand grams (1,000 g or 1 × 103 g) (1 kg = approx.2.2 lb)
Volume
 ml millilitre 1 thousandth of a litre (0.001 l or 1 × 10-3 l) l litre 1 thousand millilitres (or 1,000 cubic centimetres) (1000ml or 1 × 103 ml).(1 l = approx. 1.75 imperial pints or 1.056 US quart)
Concentration
 Concentration may be expressed as weight per volume or, alternatively, as ppmor ppb. mg/l 1 mg dissolved in 1 l of water or other solvent µg/ml 1 µg dissolved in 1 ml of water or other solvent ppm parts per million, e.g. 1 mg/kg (1 mg/1,000,000 mg)1 mg/l or 1 µg/ml = 1 part per million. ppb parts per billion, e.g. 1 µg/kg (1 µg/1,000,000 mg)1 ng/g or 1 µg/l = 1 part per billion w/v weight per volume, e.g. 20 g/100 ml = 20 % w/v w/w weight per weight, e.g. 20 g/100 g = 20 % w/w
Length
 µm micron 1 millionth of a metre (0.000001 m or 1 × 10-6 m)

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