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Why SI units matter

Why SI units matter

Concept map of SI units showing base quantities and base units, derived units, prefixes, and quantity over unit labels

A physical quantity needs both a number and a unit. Saying a time is 2.42.42.4 is incomplete, but 2.4 s2.4\text{ s}2.4 s tells us what was measured.

S.I. units Lesson

  1. A Level
  2. /Physics
  3. /S.I. units