The appropriate S.I. unit for expressing the volume of blood, a liquid, is the liter. The liter is the S.I. unit for volume, the amount of space a substance occupies. Smaller volumes are expressed using the milliliter, which is 1/1000 of a liter.
The gram is a unit of mass, which is the amount of matter present in a substance. It's related to weight and is measured using a balance. The S.I unit for mass is the kilogram, which is 1000 grams.
The meter is the S.I. unit for length. We also use the centimeter and millimeter to express smaller lengths and the kilometer to express greater lengths.
The gallon is a volume unit but isn't a metric or S.I. unit. It's used in the Standard System, which is a system of measurement used in the United States for applications other than science.
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