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  2. Planck constant - Wikipedia

    en.wikipedia.org/wiki/Planck_constant

    The Planck constant, or Planck's constant, denoted by , [1] is a ... The Planck constant has the same dimensions as action and as angular momentum.

  3. Planck units - Wikipedia

    en.wikipedia.org/wiki/Planck_units

    In Big Bang cosmology, the Planck epoch or Planck era is the earliest stage of the Big Bang, before the time passed was equal to the Planck time, t P, or approximately 10 −43 seconds. [30] There is no currently available physical theory to describe such short times, and it is not clear in what sense the concept of time is meaningful for ...

  4. List of physical constants - Wikipedia

    en.wikipedia.org/wiki/List_of_physical_constants

    Planck constant: 6.626 070 15 ... Such a constant gives the correspondence ratio of a technical dimension with its corresponding underlying physical dimension.

  5. Fine-structure constant - Wikipedia

    en.wikipedia.org/wiki/Fine-structure_constant

    In physics, the fine-structure constant, also known as the Sommerfeld constant, commonly denoted by ... h is the Planck constant (6.626 070 15 ...

  6. Action (physics) - Wikipedia

    en.wikipedia.org/wiki/Action_(physics)

    The Planck constant, written as or when including a factor of /, is called the quantum of action. [8] Like action, this constant has unit of energy times time. It figures in all significant quantum equations, like the uncertainty principle and the de Broglie wavelength. Whenever the value of the action approaches the Planck constant, quantum ...

  7. Natural units - Wikipedia

    en.wikipedia.org/wiki/Natural_units

    Planck considered only the units based on the universal constants G, h, c, and k B to arrive at natural units for length, time, mass, and temperature, but no electromagnetic units. [7] The Planck system of units is now understood to use the reduced Planck constant, ħ, in place of the Planck constant, h. [8]

  8. List of equations in quantum mechanics - Wikipedia

    en.wikipedia.org/wiki/List_of_equations_in...

    A fundamental physical constant occurring in quantum mechanics is the Planck constant, h. A common abbreviation is ħ = h /2 π , also known as the reduced Planck constant or Dirac constant . Quantity (common name/s)

  9. Dimensionless physical constant - Wikipedia

    en.wikipedia.org/.../Dimensionless_physical_constant

    where e is the elementary charge, ħ is the reduced Planck constant, c is the speed of light in vacuum, and ε 0 is the permittivity of free space. The fine-structure constant is fixed to the strength of the electromagnetic force. At low energies, α ≈ ⁠ 1 / 137 ⁠, whereas at the scale of the Z boson, about 90 GeV, one measures α ≈ ...