Thermodynamic volume is the volume occupied by a thermodynamic system, treated as an extensive variable.
The volume per amount of substance, with measured in moles. For a uniform pure substance, , where is its molar mass and its mass density. The Clapeyron equation pairs a difference of molar volumes with latent heat per mole.
The volume divided by the positive number of particles . The Van der Waals equation uses this convention for , whereas specific volume divides by mass and molar volume divides by the amount of substance. With the Avogadro constant , the molar volume is .
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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Volume (thermodynamics) by Wikipedia Bot 1
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In thermodynamics, volume refers to the amount of space that a substance (solid, liquid, or gas) occupies. It is a fundamental property of matter and plays a crucial role in understanding various thermodynamic processes and laws. Volume can be measured in different units, depending on the system of measurement used. Common units include cubic meters (m³) in the SI system, liters (L), and milliliters (mL).
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