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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“We praise a man who feels angry on the right grounds and against the right persons and also in the right manner at the right moment and for the right length of time.”
—Aristotle (384–322 B.C.)
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