Dulong and Petit's law
noun
Du·long and Pe·tit's law
ˈd(y)ü-ˌlȯŋ-ən-pə-ˈtēz-, d(y)ü-ˈ
: a law in physics and chemistry: the specific heats of most solid elements multiplied by their atomic weights are nearly the same averaging a little over six calories per degree Celsius per gram-atomic weight
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Merriam-Webster unabridged
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