Specific volume is defined as volume per unit mass of fluid. Specific volume is reciprocal of mass density.
Mathematically,
Specific volume = volume of fluid / mass of fluid.
Dimensional formula of volume = M0L3T0
Dimensional formula of mass = M1L0T0
Putting this value in the above equation we get,
Dimensional Formula of Specific volume= M-1L3T0.
SI unit of Specific volume is m3/kg .