Boost C++ Libraries Home Libraries People FAQ More

PrevUpHomeNext

Header <boost/units/systems/si/codata/electromagnetic_constants.hpp>

CODATA recommended values of fundamental electromagnetic constants.

CODATA recommended values of the fundamental physical constants: NIST SP 961 CODATA 2006 values as of 2007/03/30

namespace boost {
  namespace units {
    namespace si {
      namespace constants {
        namespace codata {

          // elementary charge 
           BOOST_UNITS_PHYSICAL_CONSTANT(e, quantity< electric_charge >, 
                                         1.602176487e-19 * coulombs, 
                                         4.0e-27 * coulombs);

          // elementary charge to Planck constant ratio 
           BOOST_UNITS_PHYSICAL_CONSTANT(e_over_h, 
                                         quantity< current_over_energy >, 
                                         2.417989454e14 *amperes/ joule, 
                                         6.0e6 *amperes/ joule);

          // magnetic flux quantum 
           BOOST_UNITS_PHYSICAL_CONSTANT(Phi_0, quantity< magnetic_flux >, 
                                         2.067833667e-15 * webers, 
                                         5.2e-23 * webers);

          // conductance quantum 
           BOOST_UNITS_PHYSICAL_CONSTANT(G_0, quantity< conductance >, 
                                         7.7480917004e-5 * siemens, 
                                         5.3e-14 * siemens);

          // Josephson constant. 
           BOOST_UNITS_PHYSICAL_CONSTANT(K_J, 
                                         quantity< frequency_over_electric_potential >, 
                                         483597.891e9 *hertz/ volt, 
                                         1.2e7 *hertz/ volt);

          // von Klitzing constant 
           BOOST_UNITS_PHYSICAL_CONSTANT(R_K, quantity< resistance >, 
                                         25812.807557 * ohms, 1.77e-5 * ohms);

          // Bohr magneton. 
           BOOST_UNITS_PHYSICAL_CONSTANT(mu_B, 
                                         quantity< energy_over_magnetic_flux_density >, 
                                         927.400915e-26 *joules/ tesla, 
                                         2.3e-31 *joules/ tesla);

          // nuclear magneton 
           BOOST_UNITS_PHYSICAL_CONSTANT(mu_N, 
                                         quantity< energy_over_magnetic_flux_density >, 
                                         5.05078324e-27 *joules/ tesla, 
                                         1.3e-34 *joules/ tesla);
        }
      }
    }
  }
}

PrevUpHomeNext