Planck length

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The length scale at which a classical description of gravity ceases to be valid, and quantum mechanics must be taken into account. It is given by LP = √(Għ/c3), where G is the gravitational constant, ħ is the rationalized Planck constant, and c is the speed of light. The value of the Planck length is of order 10−35 m (twenty orders of magnitude smaller than the size of a proton, 10−15 m).

Subjects: Physics.

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