normal modes of atomic vibration in crystalline solid.
because solids have thermal energy, atoms vibrate fixed mean positions within ordered (or disordered) lattice. spectrum of lattice vibrations in crystalline or glassy network provides foundation kinetic theory of solids. motion occurs @ atomic level, , cannot observed or detected without highly specialized equipment, such used in spectroscopy.
thermal properties of solids include thermal conductivity, property of material indicates ability conduct heat. solids have specific heat capacity, capacity of material store energy in form of heat (or thermal lattice vibrations).
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