An Etymological Dictionary of Astronomy and Astrophysics

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فرهنگ ریشه‌شناختی اخترشناسی-اخترفیزیک

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conservation of mass and energy
  پتایش ِ جرم و کاروژ  
patâyeš-e jerm o kâruž
Fr.: conservation de masse et d'énergie  

A principle, resulting from Einstein’s theory of → special relativity whereby in any → closed system the sum of mass and energy remains → constant.

See also: → conservation; → mass; → energy.