Physics Study Guide/Physics constants

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Contents

Commonly Used Physical ConstantsEdit

Uncertainty should be read as 1.234(56) = 1.2340.056
Name Symbol Value Units Relative Uncertainty
Speed of light (in vacuum) (exact)
Magnetic Constant (exact)
Electric Constant (exact)
Newtonian Gravitaional Constant
Plank's Constant
Elementary charge
Mass of the electron
Mass of the proton
Fine structure constant dimensionless
Molar gass constant
Boltzman's constant
Avogadro's Number
Rydberg constant
Standard acceleration of gravity defined
Atmospheric pressure defined
Bohr Radius
Electron Volt

To Be Merged Into TableEdit

This list is prepared in the format

  • Constant (symbol) : value

  • Coulomb's Law Constant (k) : 1/(4 π ε0) = 9.0 × 109 N·m2/C2
  • Faraday constant (F)  : 96,485 C·mol−1
  • Mass of a neutron (mn) : 1.67495 × 10−27 kg
  • Mass of Earth : 5.98 × 1024 kg
  • Mass of the Moon : 7.35 × 1022 kg
  • Mean radius of Earth : 6.37 × 106 m
  • Mean radius of the Moon : 1.74 × 106 m
  • Dirac's Constant () : = 1.05457148 × 10−34 J·s
  • Speed of sound in air at STP : 3.31 × 102 m/s
  • Unified Atomic Mass Unit (u) : 1.66 × 10−27 kg
Item Proton Neutron Electron
Mass 1 1 Negligible
Charge +1 0 -1

See AlsoEdit