Physics Study Guide/Physics constants

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Commonly Used Physical Constants[edit | edit source]

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
Boltzmann's constant
Avogadro's Number
Rydberg constant
Standard acceleration of gravity defined
Atmospheric pressure defined
Bohr Radius
Electron Volt
Luminous efficacy of monochromatic radiation (exact)
hyperfine transition frequency of Cs-133 (exact)
Reduced Planck constant (exact)
atomic mass of Carbon 12
molar mass of Carbon-12
atomic mass constant
molar mass constant
molar volume of silicon
molar Planck constant
Stefan-Boltzmann constant
first radiation constant
first radiation constant for spectral radiance [1]
second radiation constant
Wien wavelength displacement constant
Wien frequency displacement constant
Wien entropy displacement constant
Faraday constant [2]

To Be Merged Into Table[edit | edit source]

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 Also[edit | edit source]

Wiki-links[edit | edit source]

External Links[edit | edit source]

Physics Study Guide (Print Version)
Units Linear Motion Force Momentum Normal Force and Friction Work Energy
Torque & Circular Motion Fluids Fields Gravity Waves Wave overtones Standing Waves Sound
Thermodynamics Electricity Magnetism Optics
Physical Constants Frictional Coefficients Greek Alphabet Logarithms Vectors and Scalars Other Topics
  1. "first radiation constant for spectral radiance". NIST. 
  2. "Faraday constant". NIST.