Portrait of Lord Melvyn Bragg, host of In Our Time

Physical quantities

A physical quantity is a physical property of a material or system that can be quantified by measurement. A physical quantity can be expressed as a value, which is the algebraic multiplication of a ' Numerical value ' and a ' Unit '.

2 episodes

Episodes in this category also belong to the following categories:

  1. Heat

    Melvyn Bragg discusses the history of scientific ideas about heat from fire to thermodynamics.

    4 December 2008

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    Featuring: Simon Schaffer, Hasok Chang, Joanna Haigh

     
  2. The Speed of Light

    Melvyn Bragg and guests discuss the speed of light, from its first measurement in the 17th Century to Einstein’s groundbreaking ideas on relativity.

    30 November 2006

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    Featuring: John Barrow, Iwan Morus, Jocelyn Bell Burnell