Which term describes density?

• A. Density
• B. Volume
• C. Solubility
• D. Conductivity

Answer: (A)

Density describes how tightly matter is packed into a given space. It is found by dividing mass by volume (ρ = m/V). This means that for the same amount of space, a substance with more mass has higher density. That’s why a metal block feels heavy for its size, while a block of foam feels light—the metal has greater mass per unit volume. Density also helps explain floating and sinking: if something’s density is greater than the liquid, it tends to sink; if it’s less, it tends to float. The other terms describe different properties: volume is the amount of space something occupies, solubility is how well a substance dissolves in a solvent, and conductivity is how easily electricity or heat flows through a material.