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What is 4th dimension?

  1. Jul 8, 2015 #1
    Some people say that it's the 3D world we live in + time but others say that it's 4 dimensional as in it as new axis. Which one is true?
  2. jcsd
  3. Jul 8, 2015 #2


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    Staff: Mentor

  4. Jul 8, 2015 #3
    So if we talk about 4D solids,does that mean they are related to time...?
  5. Jul 8, 2015 #4


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    Staff: Mentor

    No, when we talk about 4D objects, we mean that they exist in 4 spatial dimensions and one time dimension. The 4th spatial dimension has no relation to the time dimension.
  6. Jul 8, 2015 #5
    Thanks Darkkith I understand now.
  7. Jul 9, 2015 #6


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    Science Advisor

    The main point is whether you are looking at physics (3 space + time) or math (n space, where n is any integer).
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