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Constant

From Encyclopædia

A constant is a quantity whose value, under specified conditions, does not change. Some constants never change: they remain fixed under all conditions. Much of modern science, and physics in particular, is based on the assumption that certain physical quantities are constants. The velocity of light, the gravitational constant, PLANCK'S CONSTANT, and the BOLTZMANN CONSTANT are all examples of fundamental constants (see ATOMIC CONSTANTS).

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