The volume per unit mass; for a uniform substance it is the reciprocal of mass density. The Clapeyron equation pairs a difference of specific volumes with latent heat per unit mass.
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Specific volume is defined as the volume occupied by a unit mass of a substance. It is an important thermodynamic property, particularly in the study of gases, liquids, and solids in various phases and conditions. Mathematically, the specific volume (\( v \)) can be expressed as: \[ v = \frac{V}{m} \] where: - \( V \) is the volume of the substance, - \( m \) is the mass of the substance.