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Planck's Constant Digits

  1. Apr 19, 2003 #1

    dav2008

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    OK, we all know theres tons of websites that give the digits of Pi and even e...But does anyone know how many digits we know Plancks constant to? Is experimentally the only way to determine it?
     
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  3. Apr 19, 2003 #2

    Integral

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    Unlike π and e, which are defined mathematically, h and c are experimental numbers so we do not know them to more digits then have been measured. h is sort of self limiting.
     
    Last edited: Apr 19, 2003
  4. Apr 19, 2003 #3
    NIST lists the CODATA concise form for Planck's constant as h=6.626 068 76(52) x 10-34 J s.
     
  5. Apr 19, 2003 #4

    dav2008

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    Hm..Ive seen those parenthesis after constants in my textbook...What do they mean? It says something about like theyre not certain about those digits...is that right?
     
  6. Apr 20, 2003 #5
    ()=uncertainty or experimental error(?)
     
  7. Apr 20, 2003 #6

    Integral

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    The (52) is the error in the last digits, so

    6.626 068 24 < h < 6.626 069 28
     
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