Physics Exercises/Fundamental Constants

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Table of Constants[edit]

Fundamental constants from NIST Physics Lab
Name Symbol Value Units Relative Uncertainty
Speed of light (in vacuum) (exact)
Magnetic constant (exact)
Electric constant (exact)
Newtonian gravitational constant
Plank's constant
Elementary charge
Mass of the electron
Mass of the proton
Mass of a neutron
Fine structure constant dimentionless
Molar gass constant
Boltzman's constant
Avogadro's number
Rydberg constant
Atmosphere (exact)
Electronvolt
Bohr radius
Coulomb's constant
Faraday constant
Gravitational acceleration on Earth
Mass of the Earth
Mass of the Moon
Mean radius of the Earth
Mean radius of the Moon
Dirac's Constant
Speed of sound in air at STP
Unified Atomic Mass Unit
Vacuum Permittivity
  • 1 Atmosphere Pressure (1 atm) : 1.0 × 105 N/m2 = 1.0 × 105 Pa
  • 1 Electron Volt (1 eV) : 1.60 × 10−19 J
  • Bohr radius (a0)  : 5.292 × 10−11 m
  • Coulomb's Law Constant (k) : 1/(4 π ε0) = 9.0 × 109 N·m2/C2
  • Faraday constant (F)  : 96,485 C·mol−1
  • Gravitational accelaration (g) : 9.80665 m·s-2
  • 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
  • Vacuum Permittivity (ε0) : 8.85 × 10−12 C2/(N·m2)
Item Proton Neutron Electron
Mass 1 1 Negligible
Charge +1 0 -1
Spin

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