Impact of new definitions of the SI base units.
|Unit||Constant used as reference||Symbol||Actual definition||Proposed definition|
|kg||Mass of prototype kilogram||m (K)||Exact||1.0 × 10−8|
|Planck constant||h||5.0 × 10−8||Exact|
|A||Vacuum magnetic permeability||µ 0||Exact||2.3 × 10−10|
|Elementary charge||e||2.5 × 10−8||Exact|
|K||Temperature of triple point of water||T TPW||Exact||3.7 × 10−7|
|Boltzmann constant||k B||1.7 × 10−6||Exact|
|mol||Molar mass of 12C||M (12C)||Exact||4.5 × 10−10|
|Avogadro number||N A||1.4 × 10−9||Exact|
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