摘要：

Quantum mechanics was a subject in mathematical physics which had originated in 1900 in the work of Max Planck on the equilibrium of radiation in a cavity. In plain language, the subject matter of quantum theory is the study of such light as we find inside of a hot furnace after light and hot matter have come to equilibrium so that if we look into a cavity with heated walls, such as a blast furnace, the light coming from inside the furnace changes in character as the temperature changes.

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