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A unit of blood is equivalent to approximately 1 pint or 450 milliliters, according to the Canadian Blood Services website. The average patient requires around 4.6 units of blood.
There are 0.0648524 milliliter in a drop. 1 Drop is equal to 0.0648524 Milliliter. 1 drop = 0.0648524 mL. Used very commonly in medicine and cooking, a drop is a unit of volume defined as the volume of a liquid in one drop. It has been used since the 19th century and is considered one of the most roughly specified units of volume.