CODATA System¶

Namespace: mp_units::codata

Module: mp_units.systems

Header: <mp-units/systems/codata.h>

Constants¶

Name	Symbol	unit_symbol	Definition	Relative standard uncertainty
`codata2014::magnetic_constant`	μ₀ (u_0)	—	`mag<4> * mag_power<10, -7> * π * si::henry / si::metre`	—
`codata2018::magnetic_constant`	μ₀ (u_0)	—	`mag_ratio<125'663'706'212, 100'000'000'000> * mag_power<10, -6> * si::henry / si::metre`	`mag_ratio<15, 10> * mag_power<10, -10>`
`codata2018::newtonian_constant_of_gravitation`	G	—	`mag_ratio<667'430, 100'000> * mag_power<10, -11> * cubic(si::metre) / si::kilogram / square(si::second)`	`mag_ratio<22, 10> * mag_power<10, -5>`
`codata2022::magnetic_constant`	μ₀ (u_0)	—	`mag_ratio<125'663'706'127, 100'000'000'000> * mag_power<10, -6> * si::henry / si::metre`	`mag_ratio<16, 10> * mag_power<10, -10>`
`codata2022::newtonian_constant_of_gravitation`	G	—	`mag_ratio<667'430, 100'000> * mag_power<10, -11> * cubic(si::metre) / si::kilogram / square(si::second)`	`mag_ratio<22, 10> * mag_power<10, -5>`

Constants with a relative standard uncertainty are measured rather than exact by definition, and satisfy the MeasuredConstant concept. A — means no uncertainty is declared for that constant.

Inline Namespaces

The mp_units::codata::codata2022 namespace is inline in mp_units::codata, making its members directly accessible from the parent namespace.