What is the volume per unit mass?

What is the volume per unit mass?

• A. Specific Volume
• B. Density
• C. Mass Per Volume
• D. Volume Per Mass

Answer: (A)

Volume per unit mass is how much space a given amount of mass occupies. This property is called specific volume. It’s defined as v = V/m, the reciprocal of density, since density is ρ = m/V. So when density is high, the specific volume is small, and when density is low, the specific volume is larger. In SI units, specific volume is in cubic meters per kilogram (m^3/kg). For example, water has a density of about 1000 kg/m^3, giving a specific volume of roughly 0.001 m^3/kg, while air at room conditions has a density around 1.225 kg/m^3, giving about 0.816 m^3/kg. Specific volume is a fundamental property used in thermodynamics and fluid-flow relations, such as PV = mRT, which can be rearranged to v = RT/P for a given mass. Therefore, the volume per unit mass corresponds to specific volume.

Volume per unit mass is how much space a given amount of mass occupies. This property is called specific volume. It’s defined as v = V/m, the reciprocal of density, since density is ρ = m/V. So when density is high, the specific volume is small, and when density is low, the specific volume is larger. In SI units, specific volume is in cubic meters per kilogram (m^3/kg). For example, water has a density of about 1000 kg/m^3, giving a specific volume of roughly 0.001 m^3/kg, while air at room conditions has a density around 1.225 kg/m^3, giving about 0.816 m^3/kg. Specific volume is a fundamental property used in thermodynamics and fluid-flow relations, such as PV = mRT, which can be rearranged to v = RT/P for a given mass. Therefore, the volume per unit mass corresponds to specific volume.