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Physical Constants

In Physics there are many constants. These relate the real universe (or the bits we think we understand!) to the human-invented scales of measurement.

Name Value Equation/notes
Atomic mass unit 1 u = 1.661 x 10-27 kg = 931.5 MeV c-2
Avogadro constant NA = 6.02 x 1023 mol-1
Boltzmann constant k = 1.38 x 10-23 J K-1
Coulomb's law constant 1/(4πε0) = 8.99 x 109 N m2 C-2
Electric permittivity ε0 = 8.85 x 10-12 N-1 m-2 C2
Gravitational constant G = $6.67 x 10^{-11} N⋅(m/{kg})^2$
Magnetic permeability $μ_0 = 4π x 10^{-7} T m A^{-1}$
Electron charge e = 1.60 x 10-19 C
Electron mass me = 9.11 x 10-31 kg = 5.49 x 10-4 u = 0.511 MeV c-2
Neutron mass mn = 1.675 x 10-27 kg = 1.008 665 u = 940 MeV c-2
Proton mass mp = 1.673 x 10-27 kg = 1.007 276 u = 938 MeV c-2
Planck constant h = 6.63 x 10-34 J s
Speed of light (vacuum) c = 3.00 x 108 m s-1
Stefan-Boltzmann constant σ = 5.67 x 10-8 W m-2 K-4
Universal gas constant R = 8.31 J mol-1 K-1

Content © Renewable-Media.com. All rights reserved. Created : January 10, 2014 Last updated :January 13, 2016

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Tycho Brahe

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Tycho Brahe was a Danish astronomer, whose meticulous observations and ideas about the nature of planets, stars and comets, although erroneously accommodating rather than directly challenging the long-standing Aristotelian and Ptolemaic versions of the heavens, they were nevertheless an important contribution to the coming scientific revolution, and specifically enabled his assistant, Johannes Keppler, to derive his breakthrough laws of planetary motion.

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