Physics
predefined constants


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       The following keys are used to introduce physics constants, all expressed
       in the SI system :

    


    

    
 h 
               Planck Constant (ratio of the

                   photon energy to its frequency)		
	       6.62660755 x 10-34 J.s

    
 hbar 
               Planck Constant/(2*pi)
	       1.05457267 x 10-34 J.s

    
 c 
               speed of light in vacuum
	       299792458 ms-1

    
 N 
               Avogadro number
	       6.02213674 x 1023

    
 k 
               Boltzmann constant
	       1.3806581 x 10-23J.K-1

    
 R 
               Perfect gas constant
	       8.314511869 J.K-1

    
 1/(4*pi*eps0) 
               Constant in Coulomb law
	       8.987551760 x 109 Nm2C-2

    
 G 
               Gravitational constant
	       6.6725985 x 10-11 Nm2kg-2

    
 eps0 
               vacuum permittivity
	       8.85418782 x 10-12 Fm-1

    
 mu0 
               vacuum permeability
	       4 x pi x 10-7 Hm-1

    
 e 
               absolute value of electron charge
	       1.60217733 x 10-19 C

    
 m 
               electron mass
	       9.10938975 x 10-31 kg

    
 muB 
               Bohr magneton
	       9.27401543 x 10-24 JT-1

    
 a0 
               Bohr radius
	       5.29177249 x 10-11 m

    
 Rd 
               Rydberg (13.6 eV)
	       2.17987411 x 10-18 J

    
 Hr 
               Hartree (27.2 eV)
	       4.35974822 x 10-18 J

    
 alpha 
               fine-structure constant
	       0.00729735308

    
 compton 
               Compton wavelength of electron
	       2.42631058 x 10-12 m

    
 amu 
               atomic mass unit
	       1.66054021 x 10-27 kg

    
 mp 
               proton rest mass
	       1.672614 x 10-27 kg

    
 mn 
               neutron rest mass
	       1.67492 x 10-27 kg

    
 stefan 
               Stefan constant
	       5.66914 x 10-08 Jm-2s-1K-4

    
 c1 
               first radiation constant (8*pi*hc)
	       5.66914 x 10-08 Jm-2s-1K-4

    
 c2 
               Second radiation constant
	       0.01438833 m.K

    



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