physical constants

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mathematical constants        [top] quantity symbol value e-number (base of natural logarithm) e 2.718281828 (~2.72) pi number 3.141592654 (~3.14) approximation of by a ratio   22/7 (~3.1429) 355/113 (~3.14159292) physical constants        [top] gravitational constant G 6.6720 x 10-11 N m2 kg-2 gravitational acceleration g 9.8066 m/s2 Avogadro's number NA 6.0220 x 1023 mol-1 gas constant R 8.3144 J mol-1 K-1 molar volume (ideal gas, 273.15 K, p=p0) Vm 2.2414 x 10-2 m3/mol 22.414 l/mol melting point of ice 0 oC 273.15 K (p=p0) Boltzmann's constant k (=R/NA) 1.3807 x 10-23 J/K constant of Stefan-Boltzmann 5.6703 x 10-8 W m-2 K-4 Wien's constant kw 2.8978 x 10-3 m K Planck's constant h 6.6262 x 10-34 J s light speed in vacuum c 2.9979 x 108 m/s 299790 km/s electrical permittivity (vacuum) 0 8.8542 x 10-12 F/m magnetic permeability (vacuum) µ0 1.2566 x 10-6 H/m (= 4 pi x 10-7 H/m) elementary charge e 1.6022 x 10-19 C Faraday's constant F 9.6485 x 104 C/mol proton mass (in rest) mp 1.6726 x 10-27 kg neutron mass (in rest) mn 1.6748 x 10-27 kg electron mass (in rest) me 9.1095 x 10-31 kg