units::constants Namespace Reference

namespace for physical constants like PI and Avogadro's Number. More...

Unit Containers
using	PI = unit< std::ratio< 1 >, dimensionless::scalar, std::ratio< 1 > >
static constexpr const unit_t< PI >	pi (1)
	Ratio of a circle's circumference to its diameter.
static constexpr const velocity::meters_per_second_t	c (299792458.0)
	Speed of light in vacuum.
static constexpr const unit_t< compound_unit< cubed< length::meters >, inverse< mass::kilogram >, inverse< squared< time::seconds > > > >	G (6.67408e-11)
	Newtonian constant of gravitation.
static constexpr const unit_t< compound_unit< energy::joule, time::seconds > >	h (6.626070040e-34)
	Planck constant.
static constexpr const unit_t< compound_unit< force::newtons, inverse< squared< current::ampere > > > >	mu0 (pi *4.0e-7 *force::newton_t(1)/units::math::cpow< 2 >(current::ampere_t(1)))
	vacuum permeability.
static constexpr const unit_t< compound_unit< capacitance::farad, inverse< length::meter > > >	epsilon0 (1.0/(mu0 *math::cpow< 2 >(c)))
	vacuum permitivity.
static constexpr const impedance::ohm_t	Z0 (mu0 *c)
	characteristic impedance of vacuum.
static constexpr const unit_t< compound_unit< force::newtons, area::square_meter, inverse< squared< charge::coulomb > > > >	k_e (1.0/(4 *pi *epsilon0))
	Coulomb's constant.
static constexpr const charge::coulomb_t	e (1.6021766208e-19)
	elementary charge.
static constexpr const mass::kilogram_t	m_e (9.10938356e-31)
	electron mass.
static constexpr const mass::kilogram_t	m_p (1.672621898e-27)
	proton mass.
static constexpr const unit_t< compound_unit< energy::joules, inverse< magnetic_field_strength::tesla > > >	mu_B (e *h/(4 *pi *m_e))
	Bohr magneton.
static constexpr const unit_t< inverse< substance::mol > >	N_A (6.022140857e23)
	Avagadro's Number.
static constexpr const unit_t< compound_unit< energy::joules, inverse< temperature::kelvin >, inverse< substance::moles > > >	R (8.3144598)
	Gas constant.
static constexpr const unit_t< compound_unit< energy::joules, inverse< temperature::kelvin > > >	k_B (R/N_A)
	Boltzmann constant.
static constexpr const unit_t< compound_unit< charge::coulomb, inverse< substance::mol > > >	F (N_A *e)
	Faraday constant.
static constexpr const unit_t< compound_unit< power::watts, inverse< area::square_meters >, inverse< squared< squared< temperature::kelvin > > > > >	sigma ((2 *math::cpow< 5 >(pi) *math::cpow< 4 >(R))/(15 *math::cpow< 3 >(h) *math::cpow< 2 >(c) *math::cpow< 4 >(N_A)))
	Stefan-Boltzmann constant.

Detailed Description

namespace for physical constants like PI and Avogadro's Number.

See also

See unit_t for more information on unit type containers.