A362000 -id:A362000

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A362530

Decimal expansion of the conventional value of Josephson constant (K_{J-90}) in Hz/V.

+10
1

4, 8, 3, 5, 9, 7, 9

(list; constant; graph; refs; listen; history; text; internal format)

OFFSET

15,1

COMMENTS

In 1988, the CIPM recommended the adoption of conventional value for the Josephson constant as exactly K_{J-90} = 483597.9*10^9 Hz/V as of 1 January 1990.

Consequently, in 1991, the eighteenth CGPM noted the conventional value for the Josephson constant.

Finally, in 2018, the twenty-sixth CGPM resolved to abrogate the conventional value of the Josephson constant with the 2019 redefinition of SI base units (as stated on the Wikipedia page "Conventional electrical unit", see Links).

LINKS

Table of n, a(n) for n=15..21.

NIST Physics Laboratory, Conventional value of Josephson constant K_{J-90}

Wikipedia, Conventional electrical unit

Wikipedia, Magnetic flux quantum

Wikipedia, 2019 redefinition of the SI base units

EXAMPLE

K{J-90} = 483597.9 GHz/V.

CROSSREFS

Cf. A248508, A248510, A361006, A361010, A361011, A361352, A362000.

KEYWORD

cons,nonn,fini,full

AUTHOR

Marco Ripà, Apr 24 2023

STATUS

approved

A362590

Decimal expansion of the conventional value of von Klitzing constant (R{K-90}) in ohms (Omega).

+10
0

2, 5, 8, 1, 2, 8, 0, 7

(list; constant; graph; refs; listen; history; text; internal format)

OFFSET

5,1

COMMENTS

In 1988, the CIPM recommended the adoption of conventional value for the von Klitzing constant as exactly R{K-90} = 25812.807 ohms as of 1 January 1990.

Consequently, in 1991, the eighteenth CGPM noted the conventional value for the von Klitzing constant. Furthermore, in 2000, the CIPM approved the use of the quantum Hall effect, with the value of R{K-90} to be used to establish a reference standard of resistance. Finally, in 2018, the twenty-sixth CGPM resolved to abrogate the conventional value of the von Klitzing constant with the 2019 redefinition of SI base units (as stated on the Wikipedia page "Conventional electrical unit", see Links).

LINKS

Table of n, a(n) for n=5..12.

NIST Physics Laboratory, Conventional value of von Klitzing constant R_{K-90}