27 #include <CLHEP/Units/PhysicalConstants.h> 
   33 using CLHEP::Avogadro;
 
   35 using CLHEP::c_squared;
 
   36 using CLHEP::h_Planck;
 
   37 using CLHEP::hbar_Planck;
 
   39 using CLHEP::hbarc_squared;
 
   40 using CLHEP::electron_charge;
 
   41 using CLHEP::e_squared;
 
   42 using CLHEP::electron_mass_c2;
 
   43 using CLHEP::proton_mass_c2;
 
   44 using CLHEP::neutron_mass_c2;
 
   48 using CLHEP::epsilon0;
 
   49 using CLHEP::elm_coupling;
 
   50 using CLHEP::fine_structure_const;
 
   51 using CLHEP::classic_electr_radius;
 
   52 using CLHEP::electron_Compton_length;
 
   53 using CLHEP::Bohr_radius;
 
   54 using CLHEP::alpha_rcl2;
 
   55 using CLHEP::twopi_mc2_rcl2;
 
   56 using CLHEP::k_Boltzmann;
 
   57 using CLHEP::STP_Temperature;
 
   58 using CLHEP::STP_Pressure;
 
   59 using CLHEP::kGasThreshold;
 
   60 using CLHEP::universe_mean_density;