Question

which word describes the amount of matter an object contains?
altitude
density
mass
pressure

Explanation:

• Altitude refers to height above a reference point.
• Density is mass per unit volume ($\text{density} = \frac{\text{mass}}{\text{volume}}$), not total matter.
• Mass is the defined measure of the amount of matter in an object.
• Pressure is force per unit area ($\text{pressure} = \frac{\text{force}}{\text{area}}$), unrelated to total matter.

Answer:

C. mass