Page "Debye model" Paragraph 87
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How different are the models?
To answer that question one would naturally plot the two on the same set of axes ... except one can't.
Both the Einstein model and the Debye model provide a functional form for the heat capacity.
They are models, and no model is without a scale.
A scale relates the model to its real-world counterpart.
One can see that the scale of the Einstein model, which is given by
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2.106 seconds.