Which of the following best describes the concept of density?

• A. Density is the amount of space a substance occupies.
• B. Density is the mass of a substance divided by its volume.
• C. Density is measured in units of meters per second.
• D. Density is the ratio of volume to mass.

Answer: (B)

Verified step by step guidance

1. Understand that density is a physical property that relates the mass of a substance to the space it occupies.
2. Recall the formula for density, which is given by the mass of the substance divided by its volume: \(\text{Density} = \frac{\text{Mass}}{\text{Volume}}\).
3. Recognize that density is typically expressed in units such as grams per cubic centimeter (g/cm\^3) or kilograms per liter (kg/L), not in units of speed like meters per second.
4. Note that density is not the amount of space a substance occupies (which is volume), nor is it the ratio of volume to mass (which would be the inverse of density).
5. Conclude that the best description of density is the mass of a substance divided by its volume.