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TABLE OF PHYSICAL CONSTANTS
and
ATMOSPHERIC COMPOSITION



Astronomical unit               1.496E+11       m

~ 150,000,000 km

Atomic mass unit 1.66056E-27 kg Avogadro number 6.022045E+26 /kmol Bohr radius 5.29177E-11 m Boltzmann constant 1.38054E-23 J/K Earth's radius 6.37E+06 m

~ 6,400 km

Electron mass (at rest) 9.10953E-31 kg 5.4859E-04 amu Electron compton wavelength 2.42631E-12 m Electron charge 1.602189E-19 C Electron charge-to-mass ratio 1.7588E+11 C/kg Faraday constant 9.64846E+07 C/kmol Fine structure constant 7.2974E-03 Gravitational constant 6.6720E-11 N-m2/kg2 Gravitational acceleration 9.80665 m/s2 Loschmidt Number 2.6870E+19 molecules per cubic centimeter at STP Magnetic Flux quantum 2.0678E-15 Wb Molar volume 2.24138E+01 m3/kmol Neutron mass (at rest) 1.67495E-27 kg 1.00866 amu Permeability (vaccum) 1.25664E-06 H/m Permittivity (vacuum) 8.85419E-12 F/m Planck constatnt 6.6256E-34 J-s Proton mass (at rest) 1.67265E-27 kg 1.00727 amu Quantum of circulation 3.63695E-04 J-s/kg Radiation constant, C1 3.7418E-16 W-m2 Radiation constant, C2 1.43879E-02 m-K Rydberg constant 1.09737E+07 /m Solar constant 1367 W/m2 433.3 Btu/ft2-h

~ 2 cal./ cm2 / min

Speed of light (vacuum) 2.9979E+08 m/s

~ 300,000 km/s

Stefan-Boltzman constant 5.6697E-08 W/m2-K4 5.6697E-5 erg/cm2-K4-s 5.6697E-12 W/cm2-K4 1.355E-12 cal/cm2-K4-s 3.658E-11 W/in2-K4 1.798E-08 Btu/ft2-K4-hr 1.714E-09 Btu/ft2-h-°R 5.268E-12 kWh/ft2-K4-hr 4.530E-09 kcal/ft2-K4-hr 1.52E+11 Photons/s-cm2-K3 Sun's radius 6.96E+08 m

~ 700,000 km

Sun's mean substanded full angle 0.532 Degrees 31.99 arc min Sun-to-earth mean distance, AU 1.496E+11 m Universal gas constant 8.314E+03 J/kmol-K 8.2056E-02 m3-atm/kmole-K 1.9872 cal/gmol-K Wien's Displacement 2898. µm-K (for power max) 3669. µm-K (for photons max) ATMOSPHERIC COMPOSITION (%volume): N2 78.08% O2 20.95% CO2 0.033% Ar 0.934% Ne 1.82E-03% He 5.24E-04% Kr 1.14E-04% Xe 8.7E-06% H2 5.0E-05% CH4 2.0E-04% N2O 5.0E-05

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Compiled from various references by Nahum Gat, Ph.D. The values often vary from one reference to another; hopefully this set of constants is self-consistent. Comments and corrections will be appreciated. Please address correspondence to nahum@oksi.com