3. Derived or Fundamental
• Derived quantity is expressed in terms of other quantities.
• Fundamental quantities are not expressed in terms of other quantities.
• This means density is a derived quantity.
4. Constituents
• Density is expressed in terms of mass and volume.
• Volume is measured in litres (l) or gram per cubic centimeter ( 𝑔
𝑐𝑚3).
• Mass is measured in Kilogram (Kg) or gram (g)
5. The Units
• Involving Kg and l ( 𝐾𝑔
𝑙).
• Involving g and 𝑐𝑚3
( 𝑔
𝑐𝑚3).
• These are the two most commonly used units for measuring density.
6. The SI Unit
• Not all units are SI units.
• SI units are internationally recognized.
• 𝐾𝑔
𝑙 and 𝑔
𝑐𝑚3 are the commonly used units for density.
• However 𝑔
𝑐𝑚3is the actual SI unit.