Planck length

Planck_length

very small-scale unit of length

Derived Planck Units 2017 by Pi number.jpg

Units defined only by physical constants

<span lang="en" dir="ltr"><span class="mw-page-title-main">Planck units</span></span>

In particle physics and physical cosmology, Planck units are a system of units of measurement defined exclusively in terms of four universal physical constants: c, G, ??, and kB. Expressing one of these physical constants in terms of Planck units yields a numerical value of 1. They are a system of natural units, defined using fundamental properties of nature rather than properties of a chosen prototype object. Originally proposed in 1899 by German physicist Max Planck, they are relevant in research on unified theories such as quantum gravity.

en

https://upload.wikimedia.org/wikipedia/commons/8/89/Triangle_of_everything_simplified_2_triangle_of_everything_-_Planck_Units.png

1351792235

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Planck units

standard