Planck Length, unit of measure
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The Planck length, is the unit of length approximately 1.6 * 10^-35 metres. It is in the system of units known as Planck units. The Planck length is deemed "natural" because it can be defined from three fundamental physical constants: the speed of light, Planck's constant, and the gravitational constant. Max Planck was the first to propose the Planck length, a base unit in a system of measurement he called "natural units". Although quantum mechanics and general relativity were unknown when Planck proposed his natural units, it later became clear that at a distance equal to the Planck length, gravity begins to display quantum effects, whose understanding would require a theory of quantum gravity.
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