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Physical Constants Physical Constants
Major Fields in Physics Major Fields in Physics

Physical Constants
Physical constants, or fundamental constants, are standardized values whose parameters do not change.
Constant Symbol Value in SI units
acceleration of free fall g 9.80665 m s-2
Avogadro's number NA 6.0221367 × 1023 mol-1
Boltzmann constant k 1.380658 × 10-23 J K-1
elementary charge e 1.60217733 × 10-19 C
electronic rest mass me 9.1093897 × 10-31 kg
Faraday's constant F 9.6485309 × 104 C mol-1
gas constant R 8.314510 J K-1 mol-1
gravitational constant G 6.672 × 10-11 N m2 kg-2
Loschmidt's number NL 2.686763 × 1025 m-3
neutron rest mass mn 1.6749286 × 10-27 kg
Planck's constant h 6.6260755 × 10-34 J s
proton rest mass mp 1.6726231 × 10-27 kg
speed of light in a vacuum c 2.99792458 × 108 m s-1
standard atmosphere atm 1.01325 × 105 Pa
Stefan-Boltzmann constant s 5.67051 × 10-8 W m-2 K-4
Appears in these articles:
Constant; Physics
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