Which phrase best describes density?

• A. The amount of mass per unit volume
• B. The amount of volume per unit mass
• C. The amount of energy per unit mass
• D. The amount of pressure per unit area

Answer: (A)

Verified step by step guidance

1. Understand that density is a physical property that relates how much matter is packed into a given space.
2. Recall the definition of density, which is the ratio of mass to volume.
3. Express this relationship mathematically as \(\text{Density} = \frac{\text{Mass}}{\text{Volume}}\).
4. Recognize that this means density tells us how much mass exists in each unit of volume.
5. Compare the given options and identify that the phrase 'The amount of mass per unit volume' correctly describes density.