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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1815 - 1851
Augusta Ada King, Countess of Lovelace, née Byron (father: Lord Byron the poet), is credited with being the first person to develop an algorithm for machine calculation, making her the first software writer.
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