• Some units are combinations of SI base units.
  • A derived unit is a unit that results from a mathematical combination of SI Base units.
  • We have already discussed volume and energy as two examples of derived units.
  • Some others are listed in the Table below:Area, force, speed, density, energy, volume, mass, mass-to-weight ratio, mass to weight ratio, volume to mass, energy to mass.
  • Using dimensional analysis with derived units requires special care.
  • When units are squared or cubed as with area or volume, the conversion factors must also be squared.
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