Cubic Centimeters
Cubic centimeters (cm³) are units of volume in the metric system equivelent to a milliliter. A cubic centimeter is a unit of volume equal to the volume of a cube with sides that are each 1 centimeter long. It is commonly used to measure small volumes, such as the volume of a liquid medication or the displacement of an engine. One cubic centimeter is equivalent to one milliliter in volume.
UK Barrels
A UK barrel is 36 imperial gallons (not to be confused with American gallons), about 163.659 liters or 0.163659 cubic meters. It is based on the traditional wine barrel used in the United Kingdom.