cm3

cm3 is the symbol for cubic centimeter, a unit of volume in the metric system. It is defined as the volume of a cube with sides of 1 centimeter, so 1 cm^3 equals 1 milliliter. The cubic centimeter is not an SI unit, but it is permitted for use with the SI; SI units for volume are liter (L) and cubic meter (m^3). In practical terms, 1000 cm^3 equals 1 liter, and 1 cm^3 equals 1×10^-6 m^3.

The cm^3 is widely used in fields that deal with small volumes, such as medicine to describe dosages, chemistry for sample volumes, and engineering for engine displacement measured in cubic centimeters (cc). The symbol cc is also commonly encountered, especially in medical contexts, though SI practice tends to favor mL or L.

In practice, cm^3 and mL are interchangeable for liquids and gases; for solids, volumes are often expressed in cm^3 to relate directly to density in g/cm^3. When reporting density in g/cm^3, volume and mass share the same scale. See also liter, cubic meter, milliliter, and density.