define plank length.
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In physics, the Planck length, denoted ℓP, is a unit of length. It is also the reduced Compton wavelength of a particle with Planck mass. It is equal to 1.616255×10⁻³⁵ m. It is a base unit in the system of Planck units, developed by physicist Max Planck
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In physics, the Planck length, denoted ℓP, is a unit of length. It is also the reduced Compton wavelength of a particle with Planck mass. It is equal to 1.616255(18)×10−35 m.It is a base unit in the system of Planck units, developed by physicist Max Planck. The Planck length can be defined from three fundamental physical constants: the speed of light in vacuum, the Planck constant, and the gravitational constant.
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