K326 / K327 / 2027

Chapter 1

Physical quantities and measurement

A measurement needs a clear meaning.

Learn to choose a suitable instrument, record a useful reading and check its size and unit.

Includes scalar and vector definitions, with instrument choice and practical methods. For K326 / K327 (2027) / 5086 / 5087 (2026).

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Choose a topic

  1. Physical quantities and units

    Give a measurement meaning and use the specified SI base units.

  2. Prefixes and physical scales

    Convert units and check whether the size of an answer is reasonable.

  3. Choosing measuring instruments

    Compare range and resolution to choose a suitable instrument.

  4. Making useful measurements

    Read scales, correct zero errors, time repeated events and measure volume.

  5. Scalars and vectors

    Distinguish a magnitude from a quantity that also needs direction.