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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.
One milliliter equals 1 gram only when the density of a liquid is 1 gram per milliliter. The most common substance that has 1 gram per milliliter is water. The milliliter is a unit of volume that is one-thousandth of a liter, which is the basic metric volumetric unit.