The Planck Units are originally proposed in 1899 by German physicist Max Planck, these units are also known as natural units because the origin of their definition comes only from properties of nature and not from any human construct (e.g. intensity, flux, and equivalent dose), nor any quality of earth or universe (e.g. gravity, atmosphere, and Hubble Constant), nor any quality of a given substance (e.g. melting point, density, and specific heat capacity) and nor based on properties of any prototype object or particle (e.g. elementary charge, electron mass, and proton mass); but rather on only the properties of free space. The properties of free space are speed of light as Planck speed, reduced Planck constant as Planck angular momentum and Boltzmann constant as Planck entropy.
The term Planck scale refers to the magnitudes of space, time, energy and other units, below which (or beyond which) the predictions of the Standard model, quantum field theory and general relativity are no longer applicable, but quantum effects of gravity are expected to dominate. This region may be characterized by energies around 1.96×10⁹ J (the Planck energy), time intervals around 5.39×10⁻⁴⁴ s (the Planck time) and lengths around 1.62×10⁻³⁵ m (the Planck length).
At the Planck scale, current models are not expected to be a useful guide to the cosmos, and there is no scientific model to suggest how the physical universe behaves. The best known example is represented by the conditions in the first 10⁻⁴³ seconds of our universe after the Big Bang, approximately 13.8 billion years ago.
The term Planck scale refers to the magnitudes of space, time, energy and other units, below which (or beyond which) the predictions of the Standard model, quantum field theory and general relativity are no longer applicable, but quantum effects of gravity are expected to dominate. This region may be characterized by energies around 1.96×10⁹ J (the Planck energy), time intervals around 5.39×10⁻⁴⁴ s (the Planck time) and lengths around 1.62×10⁻³⁵ m (the Planck length).
At the Planck scale, current models are not expected to be a useful guide to the cosmos, and there is no scientific model to suggest how the physical universe behaves. The best known example is represented by the conditions in the first 10⁻⁴³ seconds of our universe after the Big Bang, approximately 13.8 billion years ago.
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