*Physical constants

*Physical constants

CONSTANT SYMBOL VALUE IN SI UNITS DIMENSIONS
Absolute zero K -273.15 K [K]
Astronomical unit AU 1.5 x 10 11 m [L ]
Atomic mass unit or unified mass u 1.66 x 10 – 27 kg [M ]
Avogadro’s constant N0 6.023 x 10 23 moleucles/mol [mol– 1]
Bohr magneton mB 1.41 x 10 – 26  J/T [AL2]
Bohr’s radius b 5.29 x 10 – 11  m [L]
Boltzmann’s constant k 1.38 x 10 – 23 J mol – 1 K-1 [ML 2 T – 2 K – 1]
Coulomb’s constant k 9.00 x 10 9 N m 2 C – 2 [M1 A 2 L 3 T – 4]
Elementary charge e 1.6 x 10 – 19  C [AT]
Gravity g 9.8 ms – 2 [LT – 2]
Gravitational constant G 6.673 x 10 – 11 Nm 2 kg – 2 [M – 1 L 3 T – 2]
Mass of earth M 5.98 x 10 24 kg [M ]
Mass of electron at rest m 9.1 x 10 – 31 kg [M ]
Mechanical heat equivalent J 4.186 J cal – 1 no dimensions
Molar volume of ideal gas at STP Vm 2.27 x 10 – 2  m 3/mol [L3 mol – 1]
Loschmidt constant N0 2.69 x 10 25 m – 3 [L – 3]
Permittivity constant e0 8.85 x 10 – 12  F/m [M – 1 A 2 L – 3 T 4]
Permeability constant m0 1.26 x 10 – 6  H/m [M A– 2 L T – 2]
Planck’s constant H 6.626 x 10 – 34 Js [ML 2 T – 1]
Radius of earth R 6.4 x 10 8 m [L ]
Rydberg constant R 1.10 x 10 – 7 m – 1 [L – 1]
Specific charge of electron e/m 1.76 x 10 11  C/kg [ATL – 1]
Speed of light in vacuum c 3.0 x 10 8 m/s [L T – 1]
Standard atmospheric pressure 1 atm 1.013 x 10 5 Nm – 2 [ML – 1 T – 2]
Solar constant S 1.4 x 103 Wm – 2 [MT – 3]
Stefan – Boltzmann constant s 5.67 x 10 – 8 Wm – 2 K 4 [MT – 2 K – 4]
Triple point of water Ttr 273.16 K [K]
Universal gas constant R 8.31 J mol – 1 K – 1 [ML 2 T – 2 K – 1]
Wien’s displacement constant b 2.89 x 10 – 3 mK [LK]
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