Which quantity measures how much matter is packed into a given volume?

Which quantity measures how much matter is packed into a given volume?

• A. Density
• B. Volume
• C. Area
• D. Radius

Answer: (A)

Density is the quantity that tells how much matter is packed into a given volume. It is defined as mass per unit volume (density = mass ÷ volume), with common units like g/cm³ or kg/m³. This means that when two objects occupy the same amount of space, the one with more mass is denser. Conversely, for the same mass, increasing the volume lowers density. Volume measures how much space something occupies, while area is a two‑dimensional measure of a surface, and radius is a distance from the center. For example, a metal block and a balloon of the same size have very different densities because the block has more mass in the same volume.

Density is the quantity that tells how much matter is packed into a given volume. It is defined as mass per unit volume (density = mass ÷ volume), with common units like g/cm³ or kg/m³. This means that when two objects occupy the same amount of space, the one with more mass is denser. Conversely, for the same mass, increasing the volume lowers density. Volume measures how much space something occupies, while area is a two‑dimensional measure of a surface, and radius is a distance from the center. For example, a metal block and a balloon of the same size have very different densities because the block has more mass in the same volume.