Planck length

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The Planck length is the length at which classical ideas about gravity and space-time cease to be valid, and quantum effects dominate. This is the "quantum of length", the smallest measurement of length with any meaning.

It is about equal to 1.6 x 10−35 m or about 10−20 times the size of a proton. It is one of the Planck units, defined by Max Planck.