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The Planck time has a value of 5.39121 × 10−44 second (current uncertainty 40 × 10−44). It is the smallest time that can be operationally defined, that is, measured even in principle. The Planck length has a value of 1.61624 × 10−35 (current uncertainty 12 × 10−35) meter and represents the smallest length that can be operationally defined.

By international agreement, the distance or length, L, between two points in ...

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