# How many drops of oil does it take to pollute a gallon of water?

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A standard measure of oil pollution in water is 10 ppm (10 parts oil per 1,000,000 parts water). As a gallon of water weights 10 lbs (Imperial gal) or 8 lb (US) gal) the weight od a gallon is about 4.54 kg, or 4540 gm and there are usually thought to be 40 drops in a ml a drop of oil weighs about 0.02 gm.
So 1 drop in gallon would be 0.02 gm in 4540 gm or 1 gm in 225000 gm (4 ppm). Indicating that 2.5 drops would pollute 1 gallon of water to the 10 ppm level
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780,822

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I take it you mean "how many drops of water in a gallon"?:)) . +== . Then define the volume of a "drop"! :-)

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# How many drops in 343423668428484681262 gallons of water?

An US gallon has 3,485411784 L; multiply with your value to obtainthe total volume. Aassuming that a drop has 0,000 060 L divide the total volume withthe volume of a drop and