User:Physicsyang15/沙盒

Proposal

The CODATA 2017 Values of h, e, k, and N_A for the Revision of the SI. Institute of Physics. [29 October 2017]. </ref>}} The BIPM's Consultative Committee for Units (CCU) proposed that, in addition to the speed of light, four further constants of nature should be defined to have exact values. Using the CODATA 2017 values, these would be:

• The Planck constant h is exactly 6966662607015000000♠6.62607015×10⁻³⁴ joule-second (J⋅s).
• The elementary charge e is exactly 6981160217663400000♠1.602176634×10⁻¹⁹ coulomb (C).
• The Boltzmann constant k is exactly 6977138064900000000♠1.380649×10⁻²³ joule per kelvin (J⋅K⁻¹).
• The Avogadro constant N_A is exactly 7023602214076000000♠6.02214076×10²³ reciprocal mole (mol⁻¹).

These constants were described in the 2006 version of the SI manual, but in that version the latter three were defined as "constants to be obtained by experiment" rather than as "defining constants".

Proposal

The CODATA 2017 Values of h, e, k, and N_A for the Revision of the SI. Institute of Physics. [29 October 2017]. </ref>}} The BIPM's Consultative Committee for Units (CCU) proposed that, in addition to the speed of light, four further constants of nature should be defined to have exact values. Using the CODATA 2017 values, these would be:

• The Planck constant h is exactly 6966662607015000000♠6.62607015×10⁻³⁴ joule-second (J⋅s).
• The elementary charge e is exactly 6981160217663400000♠1.602176634×10⁻¹⁹ coulomb (C).
• The Boltzmann constant k is exactly 6977138064900000000♠1.380649×10⁻²³ joule per kelvin (J⋅K⁻¹).
• The Avogadro constant N_A is exactly 7023602214076000000♠6.02214076×10²³ reciprocal mole (mol⁻¹).

These constants were described in the 2006 version of the SI manual, but in that version the latter three were defined as "constants to be obtained by experiment" rather than as "defining constants".