An Einstein solid is a model in statistical mechanics that describes a system of non-interacting oscillators, which can be used to understand the thermodynamic properties of solids. This model was proposed by Albert Einstein in 1907 as a way to explain the specific heat of solids, particularly at low temperatures. In the Einstein solid model, the following assumptions are made: 1. **Atoms as Oscillators:** Each atom in the solid is treated as an independent quantum harmonic oscillator.

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Einstein solid by Ciro Santilli 37 Updated +Created
One important quantum mechanics experiment, which using quantum effects explain the dependency of specific heat capacity on temperature, an effect which is not present in the Dulong-Petit law.
This is the solid-state analogue to the black-body radiation problem. It is also therefore a quantum mechanics-specific phenomenon.