What is the formula for Density?

What is the formula for Density?

• A. Weight / Volume
• B. Mass / Volume
• C. Volume / Weight
• D. Weight / Volume

Answer: (D)

Density measures how much matter is in a given volume. The standard way to express it is mass per volume: ρ = m/V. Because weight is the gravitational force on that mass (W = m g), you can also have weight per volume, W/V, which equals (m g)/V = ρ g. This quantity is called weight density (or specific weight) and is related to the standard mass density by W/V = ρ g. So in contexts where density is defined as weight per unit volume, W/V is used; otherwise, the usual form is mass per volume.

Density measures how much matter is in a given volume. The standard way to express it is mass per volume: ρ = m/V. Because weight is the gravitational force on that mass (W = m g), you can also have weight per volume, W/V, which equals (m g)/V = ρ g. This quantity is called weight density (or specific weight) and is related to the standard mass density by W/V = ρ g. So in contexts where density is defined as weight per unit volume, W/V is used; otherwise, the usual form is mass per volume.