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The uncertainty when measuring time

  1. Feb 12, 2014 #1
    Does any uncertainty when measuring time?
    Can we measure time definitely(hundred percent correct)
  2. jcsd
  3. Feb 12, 2014 #2


    Staff: Mentor

    All measurements have uncertainty. Currently we can measure time to within 1 part in 4000 trillion. So it is pretty accurate but it will never be perfectly certain.
  4. Feb 12, 2014 #3


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    You can measure the time between two events quite accurately within a clock but getting the events "to the clock" without messing up the timing can be problematic. As an analogy... A stopwatch can be accurate to 100th of a second but the human sending the start/stop signal to the stopwatch may have much slower reaction and operation times.

    Interesting to read some of the issues involved in trying to measure the time it takes Neutrinos to travel 450 miles..

  5. Feb 12, 2014 #4
    You can't "measure" time.

    We can only measure the passage of time, but not time itself.

    The limit of measurement is the limit by the "clock" or timebase you use and the mechanism buy which you tag the start and stop of an event. Right now the strontium atomic clock is the most accurate timebase we have. You might do a search for that if you want actual numbers.
  6. Feb 13, 2014 #5
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