• Entry
  • Reader's guide
  • Entries A-Z
  • Subject index

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 ...

    • Loading...
    locked icon

    Sign in to access this content

    Get a 30 day FREE TRIAL

    • Watch videos from a variety of sources bringing classroom topics to life
    • Read modern, diverse business cases
    • Explore hundreds of books and reference titles