Planck's Constant Digits

  • Thread starter dav2008
  • Start date
  • #1
dav2008
Gold Member
609
1
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?
 

Answers and Replies

  • #2
Integral
Staff Emeritus
Science Advisor
Gold Member
7,201
56
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:
  • #3
3,077
4
NIST lists the CODATA concise form for Planck's constant as h=6.626 068 76(52) x 10-34 J s.
 
  • #4
dav2008
Gold Member
609
1
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?
 
  • #5
3,077
4
()=uncertainty or experimental error(?)
 
  • #6
Integral
Staff Emeritus
Science Advisor
Gold Member
7,201
56
Originally posted by Loren Booda
NIST lists the CODATA concise form for Planck's constant as h=6.626 068 76(52) x 10-34 J s.
The (52) is the error in the last digits, so

6.626 068 24 < h < 6.626 069 28
 

Related Threads on Planck's Constant Digits

Replies
2
Views
2K
Replies
6
Views
4K
  • Last Post
Replies
2
Views
2K
Replies
11
Views
2K
Replies
1
Views
959
  • Last Post
Replies
2
Views
1K
Replies
4
Views
1K
Replies
5
Views
1K
Replies
8
Views
2K
Replies
5
Views
6K
Top