What property is defined as mass per unit volume?

What property is defined as mass per unit volume?

• A. Density
• B. Specific Volume
• C. Viscosity
• D. Thermal Conductivity

Answer: (A)

Density is mass per unit volume. It tells how much matter is packed into a given space, so a higher density means more mass in the same volume. This property is central to buoyancy, pressure in fluids, and many heat transfer and fluid flow analyses. For example, water’s density is about 1000 kg/m^3 at 4°C, meaning one cubic meter contains roughly a metric ton of mass. Specific volume is the inverse of density (volume per unit mass), so it’s not mass per volume. Viscosity measures resistance to deformation or flow, and thermal conductivity describes how well a material conducts heat; neither describes mass per volume.

Density is mass per unit volume. It tells how much matter is packed into a given space, so a higher density means more mass in the same volume. This property is central to buoyancy, pressure in fluids, and many heat transfer and fluid flow analyses. For example, water’s density is about 1000 kg/m^3 at 4°C, meaning one cubic meter contains roughly a metric ton of mass. Specific volume is the inverse of density (volume per unit mass), so it’s not mass per volume. Viscosity measures resistance to deformation or flow, and thermal conductivity describes how well a material conducts heat; neither describes mass per volume.