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**Density of states??**

According to C. Kittel the density of states is the "number of orbitals per unit energy range". Alright, that's fine, but what exactly does this mean? I can understand the calculations, finding the totalt number of states by considering the fermi sphere and the volume of a single state in k-space, and then differentiating this expression with respect to the energy. But if the DOS is the number of orbitals (states) per unit energy, what would for example happen if i multiply this DOS by some energy? What would i get? Apparently some number of orbitals, but what would this number tell me?

Please enligthen me, I am sort of confused on this topic. It would certainly be nice if you could give me some examples of applications of DOS as well.

Thanks in advance!