Which property is defined as mass per unit volume of any medium?

Which property is defined as mass per unit volume of any medium?

• A. Density
• B. Elasticity
• C. Acoustics
• D. Photons

Answer: (A)

Density is defined as mass per unit volume, a measure that tells you how much matter is packed into a given space for any medium—solids, liquids, or gases. It’s an intensive property, meaning it doesn’t depend on how much material you have. This concept explains why denser materials feel heavier for their size and how density influences phenomena like sinking or floating in a fluid. For gases, density also changes with temperature and pressure via the ideal gas law, which in turn affects how sound propagates through air. Elasticity concerns stiffness, acoustics studies sound more broadly, and photons are particles of light. The description given matches density.

Density is defined as mass per unit volume, a measure that tells you how much matter is packed into a given space for any medium—solids, liquids, or gases. It’s an intensive property, meaning it doesn’t depend on how much material you have. This concept explains why denser materials feel heavier for their size and how density influences phenomena like sinking or floating in a fluid. For gases, density also changes with temperature and pressure via the ideal gas law, which in turn affects how sound propagates through air. Elasticity concerns stiffness, acoustics studies sound more broadly, and photons are particles of light. The description given matches density.