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 | N_{A} = 6.02 x 10^{23} mol^{-1} | |
Boltzmann constant | k = 1.38 x 10^{-23} J K^{-1} | |
Coulomb's law constant | 1/(4πε_{0}) = 8.99 x 10^{9} N m^{2} C^{-2} | |
Electric permittivity | ε_{0} = 8.85 x 10^{-12} N^{-1} m^{-2} C^{2} | |
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 | m_{e} = 9.11 x 10^{-31} kg = 5.49 x 10^{-4} u = 0.511 MeV c^{-2} | |
Neutron mass | m_{n} = 1.675 x 10^{-27} kg = 1.008 665 u = 940 MeV c^{-2} | |
Proton mass | m_{p} = 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 10^{8} 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} |
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1546 - 1601
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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