Which of the following equations is used to calculate the density of a substance?

• A. density = mass / volume
• B. density = mass + volume
• C. density = mass × volume
• D. density = volume / mass

Answer: (A)

Verified step by step guidance

1. Understand that density is a physical property that relates the amount of mass in a given volume of a substance.
2. Recall the definition of density, which is the ratio of mass to volume, expressed mathematically as \(\text{density} = \frac{\text{mass}}{\text{volume}}\).
3. Recognize that the other options (mass + volume, mass × volume, volume / mass) do not correctly represent this relationship because density must have units of mass per unit volume.
4. Confirm that the correct formula for density is \(\text{density} = \frac{\text{mass}}{\text{volume}}\).
5. Use this formula to calculate density when given the mass and volume of a substance.