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Planck constant
(h)
subjectfact 
Planck constanthas symbol h2001-09-27 09:33:00.0
has value 6.62606876 × 10-34 J shas URL: http://physics.nist.gov/cgi-bin/cuu/Value?h, 2001-09-27 09:33:00.0
has uncertainty 0.00000052 × 10-34 J s2001-09-27 09:33:00.0
has definition The universal constant of proportionality relating the frequency of a photon to its quantum of energy.has source: Hopkins, J. 1976 Glossary of Astronomy and Astrophysics, University of Chicago Press, 2001-09-27 09:33:00.0
has definition Planck's constant is a fundamental parameter in quantum mechanics. It determines the size of the discrete units of energy, mass, spin, etc. into which the microscopic world is partitioned.has source: Greene, B. 1999 The Elegant Universe, W.W. Norton and Co., New York, 2001-09-27 09:33:00.0
has definition A universal constant of nature that measures the magnitude of quantum mechanical effects.has source: Lightman, A., Brawer, R. 1990 The Lives and Worlds of Modern Cosmologists, Harvard University Press, 2001-09-27 09:33:00.0
is an instance of universal constant2001-09-27 09:33:00.0
fundamental physical constanthas accuracy2001-09-27 09:32:59.0
has unit2001-09-27 09:32:59.0