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How was a unit of energy first defined?

  1. Aug 22, 2012 #1
    How was a unit of energy first defined? I know we measure energy in units of Joules as named after James Prescott Joule and a Joule is defined as 1kg*(m/s)^2 But I can't find any information on the history of the unit itself, how and when was it first defined, by whom? How was it decided or discovered that energy is measured in units of 1kg*(m/s)^2 ?
  2. jcsd
  3. Aug 22, 2012 #2
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