Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Planck length

  1. Nov 20, 2005 #1
    Could someone give me a layman's definition of this unit? I've looked about on wikipedia and Google search results, but I'm still not clear on what this measurement actually is?

  2. jcsd
  3. Nov 20, 2005 #2
    planck length = sqrt[(G*h-bar)/c^3]=10^-35m
    G=gravtational constant
    h-bar=plancks constant over 2pi
    c= speed of light
    Plancks length combines all the constants of nature and gives kind of a length where quantum mechanics and general relitivity breaks down. it's also the hypothetical lenght of an average string in string theory
    Last edited: Nov 20, 2005
  4. Nov 20, 2005 #3
    you can also combine the constants of nature to give you planck energy and planck time
  5. Dec 3, 2005 #4
    it is the scale at which all the forces of nature are unified
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?

Similar Discussions: Planck length
  1. Planck Length (Replies: 3)

  2. Planck length. (Replies: 7)