КВАНТ ДЕЙСТВИЯ

Quantum of Action

A universal constant equal to 6.55×10⁻²⁷ erg/sec, denoted by h. A fundamental quantity in quantum mechanics, it was discovered by Planck in 1900. The quantum of action can be regarded as the boundary between small-scale and large-scale phenomena. The domain in which it can be neglected and assumed to be zero is the macroscopic domain. As contrasted, in the domain of microscopic events the quantum of action cannot, as a matter of principle, be assumed to tend to zero.

The basic importance of the quantum of action is that it establishes the connection between dialectically contradictory and mutually exclusive properties of microscopic particles. This connection is expressed in equations of Louis de Broglie (see also Wave-Corpuscular Dualism, the Uncertainty Principle).

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