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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); } } } } }