Mass per unit volume is defined as:

Mass per unit volume is defined as:

• A. Density
• B. Mass
• C. Volume
• D. Specific gravity

Answer: (A)

Density is the measure of how much mass is packed into a given volume. It is defined as mass divided by volume, with common units like kilograms per cubic meter or grams per cubic centimeter. This shows why an object with the same volume but more mass has a higher density, while an object with the same mass but larger volume has a lower density. Mass alone tells you how much matter there is, but not how closely it’s packed. Volume tells you how much space something occupies, but not how much matter it contains. Specific gravity is a comparison of a material’s density to that of water; it’s a ratio, not the actual mass per unit volume, although it relies on the same density concept. Therefore, the term that describes mass per unit volume is density.

Density is the measure of how much mass is packed into a given volume. It is defined as mass divided by volume, with common units like kilograms per cubic meter or grams per cubic centimeter. This shows why an object with the same volume but more mass has a higher density, while an object with the same mass but larger volume has a lower density.

Mass alone tells you how much matter there is, but not how closely it’s packed. Volume tells you how much space something occupies, but not how much matter it contains. Specific gravity is a comparison of a material’s density to that of water; it’s a ratio, not the actual mass per unit volume, although it relies on the same density concept. Therefore, the term that describes mass per unit volume is density.