Cubic millimeter (mm³)
Definition: A cubic millimeter (symbol: mm³) is the volume of a cube with sides of one millimeter. It equals one thousandth of a milliliter.
History/origin: The cubic millimeter developed as a practical micro-scale metric unit for medicine, materials science, and precision engineering.
Current use: Cubic millimeters are used for blood counts, tiny specimen volumes, microfluidics, and small manufactured parts.


