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  1. Oxford Dictionary

    thermal efficiency

    • n.
      the efficiency of a heat engine measured by the ratio of the work done by it to the heat supplied to it.

    • noun: thermal efficiency, plural noun: thermal efficiencies

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    thermal efficiency

    • IPA[ˈTHərməl əˈfiSHənsē]
    • n.
      the efficiency of a heat engine measured by the ratio of the work done by it to the heat ...

    Oxford American Dictionary