In physics, the Planck length, denoted ℓP, is a unit of length, equal to 1.616199(97)×10−35 metres. It is a base unit in the system of Planck units. The Planck length can be defined from three fundamental physical constants: the speed of light in a vacuum, Planck's constant, and the gravitational constant.
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“The grace of novelty and the length of habit, though so very opposite to one another, yet agree in this, that they both alike keep us from discovering the faults of our friends.”
—François, Duc De La Rochefoucauld (1613–1680)
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