Fundamental Physical Constants

НазваниеFundamental Physical Constants
Дата конвертации17.02.2013
Размер5.7 Kb.
Fundamental Physical Constants*

Name Symbol Value

Speed of light c 2.99792458×108 m/s

Magnitude of charge of electron e 1.60217653(14) ×10-19 C

Gravitational constant G 6.6742(10) ×10-11 N∙m2/kg2

Planck’s constant h 6.6260693(11) ×10-34 J∙s

Boltzmann constant k 1.3806505(24) ×10-23 J/K

Avogadro’s number NA 6.0221415(10) ×1023 molecules/mol

Gas constant R 8.314472(15) J/mol∙K

Mass of electron me 9.1093826(16) ×10-31 kg

Mass of proton mp 1.67262171(29) ×10-27 kg

Mass of neutron mn 1.67492728(29) ×10-27 kg

Permeability of free space µo 4π×10-7Wb/A∙m

Permittivity of free space ɛo=1/µoc2 8.854187817…×10-12 C2/N∙m2

1/4πɛo 8.987551787…×109 N∙m2/C2

Other Useful Constants*

Name Symbol Value

Mechanical equivalent of heat 4.186 J/cal (15° calorie)

Standard atmospheric pressure 1 atm 1.01325×105 Pa

Absolute zero 0 K –273.15° C

Electron volt 1 eV 1.60217653(14) ×10-19 J

Atomic mass unit 1 u 1.66053886(28) ×10-27 kg

Electron rest energy mec2 0.510998918(44) MeV

Volume of ideal gas (0°C and 1 atm) 22.413996(39) liter/mol

Acceleration due to gravity (standard) g 9.80665 m/s2

*Source: National Institute of Standards and Technology ( Numbers in parenthesis show the uncertainty in the final digits of the main number; for example, the number 1.6454(21) means 1.6454 ± 0.0021. Values shown without uncertainties are exact.

Young, Hugh D., and Roger A. Freedman. University Physics with Modern Physics. 12th Edition. San Francisco: Pearson Addision-Wesley, 2008.

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