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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© ; TechExpo Corp™ 1995-1999.
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