Mass per unit volume is known as what?

Mass per unit volume is known as what?

• A. Density
• B. Viscosity
• C. Specific Gravity
• D. Osmolarity

Answer: (A)

Mass per unit volume is a measure of how compact a material is, and that property is called density. It’s defined as density = mass ÷ volume, so doubling the mass in the same volume doubles the density. Common units include g/cm^3 for solids, g/mL or kg/L for liquids, and kg/m^3 in SI. Water has a density of about 1 g/mL under standard conditions. Specific gravity is a related idea: it’s the ratio of a material’s density to the density of water, making it dimensionless. Osmolarity refers to the concentration of osmotically active particles per liter and is not a measure of mass per volume. Viscosity describes how resistant a fluid is to flow, also not about mass per volume. So the term that matches mass per unit volume is density.

Mass per unit volume is a measure of how compact a material is, and that property is called density. It’s defined as density = mass ÷ volume, so doubling the mass in the same volume doubles the density. Common units include g/cm^3 for solids, g/mL or kg/L for liquids, and kg/m^3 in SI. Water has a density of about 1 g/mL under standard conditions. Specific gravity is a related idea: it’s the ratio of a material’s density to the density of water, making it dimensionless. Osmolarity refers to the concentration of osmotically active particles per liter and is not a measure of mass per volume. Viscosity describes how resistant a fluid is to flow, also not about mass per volume. So the term that matches mass per unit volume is density.