# quantum of action

## quantum of action

[′kwän·təm əv ′ak·shən] (quantum mechanics)

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(quantum mechanics)

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There is no denying that, considering the universality of the quantum of action, it is very tempting to regard any classical theory as a limiting case to some quantal theory.

The smallest unit of action is one quantum of action, which is a universal constant denoted by "h" (Planck's constant) where n is an integer:

Action occurs in physics as: 'the quantum of action' (Planck's universal constant unit of action), and in 'the principle of least-action', as calculated by a Lagrangian or Hamiltonian action-integral.

One of the features of the physical quanta (quantum of action, quantum of light, quantum of energy) is invariance (similarity) of every quantum in a consecutive line of their formation (for example, in radiations of photons--the quanta of light).

His initial break-through came as an insight that Planck's quantum of action should be incorporated into the explanation of the mysterious stability of Rutherford's atom.

The discovery of the quantum of action meant, in the eyes of Bohr, that the physical description of the quantum world had to forsake some principles that had been so essential for the development of classical physics.

According to equation (5), in the first half period a quantum of action is destroyed, and in the second half one a quantum of action is created.

The core feature of quantum mechanics is a subatomic process known as the quantum of action. This term refers to an oddly nonlinear quantized spinning that occurs at the Planck length and is associated with the emission of radiant energy.

Obviously, such concepts as macro-world, micro-world, mega-world, quantum of action, light velocity, particle-wave dualism, temporal-similar and spatial-similar intervals, etc., were the specific forms of such concepts as system, subsystem, element of system, super-system, upper and low limits as the system's integrity criteria, etc.

More precisely, the uncertainty principle states that the product of the uncertainties regarding position and momentum must be greater than or equal to Planck's quantum of action divided by twice [pi] (pi): If x is position, p is momentum, [delta] is amount of indeterminacy, and ["h bar" sign] ("h bar") is Planck's constant divided by 2[pi] then the formula reads [delta]x[delta]p [greater than or equal to]h.

The phase of the contribution from a given path is the action S for that path in units of the quantum of action [??]".

On this view, the existence of life must be considered as an elementary fact that cannot be explained, but must be taken as a starting point in biology, in a similar way as the quantum of action, which appears as an irrational element from the point of view of classical mechanics, taken together with existence of the elementary particles, forms the foundation of atomic physics.

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