KnowraEinstein solidLinked fromLinked fromThe 4 pages that link to Einstein solid, each with the reason it gives.All 4Compared with 4Debye modelCompared with: Debye replaced Einstein’s single vibrational frequency with a spectrum of acoustic modes.Dulong–Petit lawCompared with: Einstein’s model explains the low-temperature decline that the classical law cannot.Debye T³ lawCompared with: It improved on classical theory but predicts an exponential low-temperature heat capacity, not a T³ power law.Kopp's lawCompared with: It explains temperature-dependent heat capacity microscopically, unlike Kopp's composition-based empirical sum.