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particles comes a better
understanding of such phenomena as thermal conductivity, heat capacity,
electric conductivity and the very existence of transistors and thermostats.
Quantum mechanics is a complex subject, largely outside the scope of this text,
yet a brief mention of two of its most important concepts may aid the production design engineer in the study of the basic characteristics of materials. One of these is Planck's quantum hypothesis, later extended by Einstein and others.
The quantum hypothesis postulates that the bound energy state of particles of very small size cannot be represented by a continuous function but is discrete in nature. Thus, between any two permissible energy states of a bound particle there exists a region of states that are forbidden.
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