Physical Constant - Table of Adopted Values

Table of Adopted Values

Quantity Symbol Value (SI units) Relative Standard Uncertainty
conventional value of Josephson constant 4.835 979 × 1014 Hz·V−1 defined
conventional value of von Klitzing constant 25 812.807 Ω defined
molar mass constant 1 × 10−3 kg·mol−1 defined
of carbon-12 1.2 × 10−2 kg·mol−1 defined
standard acceleration of gravity (gee, free-fall on Earth) 9.806 65 m·s−2 defined
standard atmosphere 101 325 Pa defined

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