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

CODATA recommended values of fundamental universal constants using CODATA 2006 values as of 2007/03/30

namespace boost {
  namespace units {
    namespace si {
      namespace constants {
        namespace codata {
           BOOST_UNITS_PHYSICAL_CONSTANT(c, quantity< velocity >, 
                                         299792458.0 *meters/, 0.0 *meters/);

          // magnetic constant (exactly 4 pi x 10^(-7) - error is due to finite precision of pi) 
           BOOST_UNITS_PHYSICAL_CONSTANT(mu_0, 
                                         quantity< force_over_current_squared >, 
                                         12.56637061435917295385057353311801153679e-7 *newtons/ampere/ ampere, 
                                         0.0 *newtons/ampere/ ampere);

          // electric constant 
           BOOST_UNITS_PHYSICAL_CONSTANT(epsilon_0, 
                                         quantity< capacitance_over_length >, 
                                         8.854187817620389850536563031710750260608e-12 *farad/ meter, 
                                         0.0 *farad/ meter);

          // characteristic impedance of vacuum 
           BOOST_UNITS_PHYSICAL_CONSTANT(Z_0, quantity< resistance >, 
                                         376.7303134617706554681984004203193082686 * ohm, 
                                         0.0 * ohm);

          // Newtonian constant of gravitation. 
           BOOST_UNITS_PHYSICAL_CONSTANT(G, 
                                         quantity< volume_over_mass_time_squared >, 
                                         6.67428e-11 *cubic_meters/kilogram/second/ second, 
                                         6.7e-15 *cubic_meters/kilogram/second/ second);

          // Planck constant. 
           BOOST_UNITS_PHYSICAL_CONSTANT(h, quantity< energy_time >, 
                                         6.62606896e-34 *joule * seconds, 
                                         3.3e-41 *joule * seconds);

          // Dirac constant. 
           BOOST_UNITS_PHYSICAL_CONSTANT(hbar, quantity< energy_time >, 
                                         1.054571628e-34 *joule * seconds, 
                                         5.3e-42 *joule * seconds);

          // Planck mass. 
           BOOST_UNITS_PHYSICAL_CONSTANT(m_P, quantity< mass >, 
                                         2.17644e-8 * kilograms, 
                                         1.1e-12 * kilograms);

          // Planck temperature. 
           BOOST_UNITS_PHYSICAL_CONSTANT(T_P, quantity< temperature >, 
                                         1.416785e32 * kelvin, 
                                         7.1e27 * kelvin);

          // Planck length. 
           BOOST_UNITS_PHYSICAL_CONSTANT(l_P, quantity< length >, 
                                         1.616252e-35 * meters, 
                                         8.1e-40 * meters);

          // Planck time. 
           BOOST_UNITS_PHYSICAL_CONSTANT(t_P, quantity< time >, 
                                         5.39124e-44 * seconds, 
                                         2.7e-48 * seconds);
        }
      }
    }
  }
}

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