Volume is derived from distance yes. There are only 7 'base' SI units: meter, kilogram, second, ampere, kelvin, mole, and candela (luminous intensity), with eve

Volume is derived from distance yes. There are only 7 'base' SI units: meter, kilogram, second, ampere, kelvin, mole, and candela (luminous intensity), with everything else derived. If you consider that a mole is just an amount (barely a unit at all really) and candelas are extremely specific, it's a pretty tidy system.