Introduction To Engineering Design (IED) EOC Practice Test

Density is defined as which of the following?

Mass per unit volume. Mass times volume. Volume per mass. The density of air only.

Correct Answer:

Mass per unit volume.

Explanation:

Density measures how much mass is packed into a given volume. It is defined as mass divided by volume, so density = mass per unit volume (m/v). This means that increasing mass in the same volume or shrinking the volume for the same mass raises density. The idea of mass times volume would give a different quantity with inappropriate units, not density. The inverse, volume per mass, is the reciprocal of density and is called specific volume, not density. And density isn’t limited to air; every material has its own density under given conditions.

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