How Many Drops in a Milliliter?

There are more than one type of drop. The metric drop is a 1/20 mL. This means it take 20 drops to make one milliliter. A medical drop is 1/12 of a mL. This means is take 12 drops for one mL. You can find more information here: http://en.wikipedia.org/wiki/Drop_%28volume%29
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