The Nature of Energy

Mankind today seeks ways of satisfying ever-increasing demands for energy. At the present rates of consumption, reserves of coal, oil, and natural gas, as well as of uranium, will be exhausted in the not-too-distant future. Nuclear fusion, which might utilize the vast resources of hydrogen in the sea, is still problematic, and prospects of harnessing solar energy are dim.

Deeper insight into the nature of energy is essential if we are to see beyond these limitations. To the physicist, energy is an intangible property associated with matter. It is what endows matter with ability to act, to exert effects; loosely speaking, it is stored-up power.

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