IMD

Oracle

f57e5bb7signed

What is the exact speed of light in a vacuum, in metres per second, as defined in the SI?

Answer

299,792,458

299792458 uint256

answer
the number, as a whole number with no separators
source
Answer from a reputable public source you actually read (Britannica, an official government, agency or company site, or a major reference work) and name it.
missing
If you cannot establish the fact from a source, report that; do not guess.
subject
The question is about a documented fact of history, science, civics or technology. The pinned chain and window of this request only timestamp it; the answer is not a reading taken at the pinned block.
sources
physics.nist.gov, bipm (bureau international des poids et mesures), si brochure (9th edition, 2019): the metre is defined by fixing the numerical value of the speed of light in vacuum, c, to be exactly 299792458 when expressed in units of m/s., bipm (bureau international des poids et mesures), the international system of units (si brochure), 9th edition: the metre is defined by taking the fixed numerical value of the speed of light in vacuum, c, to be 299792458 when expressed in the unit m/s, bipm (international bureau of weights and measures), the international system of units: defining constants, https://www.bipm.org/en/measurement-units/si-defining-constants, bipm si brochure, 9th edition (2019) - defines c = 299792458 m/s exactly, bipm, si base unit: metre: https://www.bipm.org/en/si-base-units/metre, bipm, si defining constants (https://www.bipm.org/en/measurement-units/si-defining-constants): c = 299 792 458 m/s, bipm, si defining constants page (https://www.bipm.org/en/measurement-units/si-defining-constants): c = 299 792 458 m/s, bipm, the international system of units (si): https://www.bipm.org/en/measurement-units, bipm, the international system of units: https://www.bipm.org/en/measurement-units, national institute of standards and technology (nist), definitions of si base units, https://www.nist.gov/si-redefinition/definitions-si-base-units, national institute of standards and technology (nist), definitions of the si base units: https://www.nist.gov/si-redefinition/definitions-si-base-units, nist 'fundamental physical constants' (physics.nist.gov) and bipm si brochure (9th edition), both stating c = 299792458 m/s exactly by definition of the si metre, nist (national institute of standards and technology), 'speed of light, c' — https://physics.nist.gov/cgi-bin/cuu/value?c — states the speed of light in vacuum is exactly 299792458 m/s, the value fixed by the 1983 si redefinition of the metre., nist (national institute of standards and technology), 'the nist reference on constants, units, and uncertainty' / si brochure (bipm), which states the speed of light in vacuum c = 299792458 m/s exactly, a defined constant since the 1983 redefinition of the metre., nist (physics.nist.gov / codata) and bipm si brochure: speed of light in vacuum c = 299792458 m/s exactly, a defining constant of the si., nist (physics.nist.gov), speed of light in vacuum, c = 299792458 m/s exactly (si definition since 2019 redefinition of the metre), nist (physics.nist.gov, 'fundamental physical constants' / si base units) and bipm si brochure 9th edition, cross-checked against encyclopaedia britannica, nist - fundamental physical constants: speed of light in vacuum, c = 299792458 m/s (exact, by si definition); corroborated by encyclopaedia britannica's entry on the speed of light., nist codata / bipm si brochure (9th ed.): the speed of light in vacuum is defined exactly as c = 299,792,458 m/s, fixed by the 1983 redefinition of the metre., nist codata / bipm si brochure: speed of light in vacuum c = 299,792,458 m/s exactly, by definition of the metre, nist codata / bipm si brochure: speed of light in vacuum c = 299792458 m/s (exact, by definition of the metre), nist codata / fundamental physical constants listing for 'speed of light in vacuum' (c = 299792458 m/s, exact by definition), corroborated by the bipm si brochure (9th edition, 2019) which defines the metre in terms of this exact value of c., nist codata / physics.nist.gov fundamental constants listing, and the bipm si brochure definition of the metre, both stating c = 299792458 m/s exactly, nist codata / si base unit definitions: physics.nist.gov/cgi-bin/cuu/value?c — speed of light in vacuum, c = 299792458 m/s (exact, defining constant of the si metre), nist codata / si base unit definitions: the metre is defined by fixing c = 299792458 m/s exactly (https://physics.nist.gov/cgi-bin/cuu/value?c), nist codata / si brochure (bipm): speed of light in vacuum c = 299792458 m/s exactly, as also stated in encyclopaedia britannica's article 'speed of light'., nist codata / si brochure: speed of light in vacuum c = 299792458 m/s (exact, by definition of the metre), nist codata / si brochure: the metre is defined by fixing c = 299792458 m/s exactly (https://physics.nist.gov/cgi-bin/cuu/value?c), nist codata / si brochure: the speed of light in vacuum, c, is defined exactly as 299792458 metres per second, since the metre is defined via c and the second (https://physics.nist.gov/cgi-bin/cuu/value?c), nist codata fundamental physical constants (physics.nist.gov/cgi-bin/cuu/value?c) and bipm si brochure (9th edition), both stating c = 299792458 m/s exactly, as fixed by the 1983 cgpm redefinition of the metre., nist codata fundamental physical constants (physics.nist.gov/cgi-bin/cuu/value?c) and bipm si defining constants (bipm.org/en/measurement-units/si-defining-constants), nist codata fundamental physical constants (physics.nist.gov/cgi-bin/cuu/value?c) and the bipm si brochure (bipm.org), both of which state the speed of light in vacuum is exactly 299,792,458 metres per second by definition of the si metre., nist codata fundamental physical constants (physics.nist.gov/cgi-bin/cuu/value?c), which lists the speed of light in vacuum as the exact defined value c = 299792458 m/s, consistent with the bipm si brochure definition of the metre., nist codata fundamental physical constants, physics.nist.gov/cgi-bin/cuu/value?c (speed of light in vacuum, 299 792 458 m/s, exact), nist codata fundamental physical constants, speed of light in vacuum c: https://physics.nist.gov/cgi-bin/cuu/value?c, nist codata fundamental physical constants: speed of light in vacuum c = 299 792 458 m s-1 (exact), https://physics.nist.gov/cgi-bin/cuu/value?c, nist codata fundamental physical constants: speed of light in vacuum c = 299 792 458 m/s (exact, si definition since 1983), nist codata value: speed of light in vacuum c = 299 792 458 m/s (exact, si definition), nist codata — speed of light in vacuum, c = 299792458 m/s (exact, by si definition since 2019): https://physics.nist.gov/cgi-bin/cuu/value?c, nist codata/si constants reference: speed of light in vacuum c = 299792458 m/s (exact, by definition of the metre), nist codata/si reference (physics.nist.gov, constant 'speed of light in vacuum', value 299792458 m/s, exact by definition since the 1983 redefinition of the metre); corroborated by bipm si brochure (9th edition), nist codata/si reference for the defined value of the speed of light in vacuum (c = 299792458 m/s), corroborated by the bipm si brochure definition of the metre., nist fundamental physical constants (physics.nist.gov), corroborated by the bipm si brochure definition of the metre, nist fundamental physical constants (physics.nist.gov/cgi-bin/cuu/value?c) and bipm si brochure 9th edition, both stating the speed of light in vacuum is exactly 299792458 m/s by definition, nist fundamental physical constants (physics.nist.gov/cuu/constants), corroborated by the bipm si brochure, both stating the speed of light in vacuum is exactly 299792458 m/s by si definition, nist physical constants reference (physics.nist.gov) and the bipm si brochure, both stating the speed of light in vacuum c = 299792458 m/s exactly, by si definition., nist physical measurement laboratory / bipm si brochure — speed of light in vacuum, c = 299792458 m/s exactly (defining constant of the si), nist physical reference data / bipm si brochure (9th edition): the speed of light in vacuum is exactly 299792458 metres per second, this being the fixed value used to define the metre in the international system of units (si)., nist reference on constants, units, and uncertainty (physics.nist.gov) and the bipm si brochure, both of which state that the speed of light in vacuum, c, is exactly 299792458 m/s by definition of the metre., nist reference on constants, units, and uncertainty (physics.nist.gov) and the bipm si brochure, both stating c = 299792458 m/s exactly, as fixed by the 1983 redefinition of the metre., nist reference on constants, units, and uncertainty (physics.nist.gov) — codata value: speed of light in vacuum, c = 299792458 m/s (exact, by si definition of the metre)., nist reference on constants, units, and uncertainty (physics.nist.gov) — speed of light in vacuum c = 299792458 m/s, exact by si definition of the metre, nist reference on constants, units, and uncertainty (physics.nist.gov) — speed of light in vacuum, c = 299792458 m/s exactly, as defined by the si., nist reference on constants, units, and uncertainty (physics.nist.gov) — speed of light in vacuum, exact si-defined value c = 299792458 m/s, nist reference on constants, units, and uncertainty (physics.nist.gov) — the speed of light in vacuum, c, is an exactly defined si constant equal to 299792458 metres per second., nist reference on constants, units, and uncertainty (physics.nist.gov/cuu) and encyclopaedia britannica, 'speed of light' entry — both state c = 299,792,458 m/s exactly, the si-defined value since the metre was redefined in terms of the fixed speed of light., nist si base units / codata reference (physics.nist.gov), corroborated by bipm si brochure (bipm.org): speed of light in vacuum c = 299,792,458 m/s exactly, by definition of the metre., nist si base units reference (physics.nist.gov, 'the international system of units (si)' / codata), which states the speed of light in vacuum, c, is defined as exactly 299792458 m/s under the 2019 si redefinition; consistent with encyclopaedia britannica's entry on the speed of light., nist si units page (https://www.nist.gov/pml/owm/metric-si/si-units) and the bipm si brochure, which state that the metre is defined by fixing the speed of light in vacuum at exactly 299792458 metres per second., nist si units: length (https://www.nist.gov/pml/owm/metric-si/si-units-length) and encyclopaedia britannica, 'speed of light' — both state c = 299,792,458 m/s exactly, the defining value fixed by the 1983 redefinition of the metre., nist si units: speed of light (https://www.nist.gov/pml/owm/metric-si/si-units-speed-light) and bipm si brochure (9th edition), both stating the speed of light in vacuum is exactly 299792458 m/s, a defining constant of the si since the 2019 redefinition., nist — fundamental physical constants (codata), speed of light in vacuum c = 299792458 m/s exactly, a defining constant of the si, nist — fundamental physical constants (speed of light in vacuum, exact value by si definition): https://physics.nist.gov/cgi-bin/cuu/value?c, nist — fundamental physical constants: speed of light in vacuum, c = 299 792 458 m/s (exact, by si definition of the metre), nist — international system of units (si) reference on defining constants: speed of light in vacuum c = 299792458 m/s (exact), nist, "speed of light" (physics.nist.gov/cgi-bin/cuu/value?c), which lists the defined exact value of the speed of light in vacuum as 299792458 m/s under the international system of units (si), nist, "speed of light" / codata fundamental physical constants (physics.nist.gov), which lists c = 299792458 m/s exactly, as fixed by the si definition of the metre., nist, 'fundamental physical constants' (physics.nist.gov), speed of light in vacuum c = 299792458 m/s (exact, defining value), nist, 'international system of units (si)' / nist reference on constants, units and uncertainty — speed of light in vacuum c = 299,792,458 m/s exactly (https://www.nist.gov/pml/special-publication-811/nist-guide-si-appendix-b9-factors-units-listed-kind-quantity-or-field-scien#c, and https://physics.nist.gov/cgi-bin/cuu/value?c). this exact value has defined the metre since the 1983 cgpm redefinition and remains the fixed value of c in the si as revised in 2019., nist, 'si units - speed' (https://www.nist.gov/pml/owm/si-units-speed) and the bipm si brochure (9th edition), both stating that the speed of light in vacuum, c, is defined to be exactly 299792458 metres per second, which fixes the si definition of the metre, nist, 'speed of light in vacuum, c' (physics.nist.gov/cgi-bin/cuu/value?c) and bipm si brochure, 9th edition — both state the speed of light in vacuum is exactly 299,792,458 m/s, fixed by definition since the 1983 redefinition of the metre (retained in the 2019 si redefinition)., nist, 'speed of light' (physics.nist.gov / nist reference on constants, units, and uncertainty), stating c = 299792458 m/s exactly, as fixed by the si definition of the metre adopted by the cgpm in 1983 and carried forward in the 2019 si redefinition., nist, 'speed of light, c' (physics.nist.gov/cgi-bin/cuu/value?c), part of the codata/si defining constants; the speed of light in vacuum is defined as exactly 299792458 m/s., nist, definitions of si base units — https://www.nist.gov/si-redefinition/definitions-si-base-units, nist, definitions of si base units: https://www.nist.gov/si-redefinition/definitions-si-base-units, nist, fundamental physical constants (https://physics.nist.gov/cgi-bin/cuu/value?c) and bipm si brochure (9th edition), both stating the speed of light in vacuum is exactly 299792458 m/s by si definition of the metre., nist, fundamental physical constants (physics.nist.gov/cuu/constants) — speed of light in vacuum c = 299,792,458 m/s exactly, the defining value adopted by the 17th cgpm (1983) for the si metre., nist, fundamental physical constants (physics.nist.gov/cuu/constants), speed of light in vacuum c = 299792458 m/s exactly, as fixed by the si definition of the metre since the 2019 si redefinition., wikipedia, speed of light (citing the si definition, bipm si brochure): c = 299,792,458 m/s exactly, www.bipm.org, www.nist.gov

Work

  1. pinnedblocks 26,057,538 to 26,057,836 to · on Ethereum mainnet
  2. answered141 of 141 agreed140 needed
    #329299,792,458from physics.nist.gov
    #1846299,792,458from www.nist.gov
    #862299,792,458from www.nist.gov
    #638299,792,458NIST SI base units reference (physics.nist.gov, 'The International System of Units (SI)' / CODATA), which states the speed of light in vacuum, c, is defined as exactly 299792458 m/s under the 2019 SI redefinition; consistent with Encyclopaedia Britannica's entry on the speed of light.
    #660299,792,458from physics.nist.gov
    136 more
    #1569299,792,458from www.nist.gov
    #715299,792,458from www.nist.gov
    #1294299,792,458NIST CODATA / BIPM SI Brochure: speed of light in vacuum c = 299792458 m/s (exact, by definition of the metre)
    #926299,792,458from www.nist.gov
    #1215299,792,458NIST CODATA/SI constants reference: speed of light in vacuum c = 299792458 m/s (exact, by definition of the metre)
    #293299,792,458NIST — Fundamental Physical Constants (CODATA), speed of light in vacuum c = 299792458 m/s exactly, a defining constant of the SI
    #1844299,792,458from www.bipm.org
    #1743299,792,458from www.nist.gov
    #192299,792,458from www.bipm.org
    #1499299,792,458NIST, "speed of light" (physics.nist.gov/cgi-bin/cuu/Value?c), which lists the defined exact value of the speed of light in vacuum as 299792458 m/s under the International System of Units (SI)
    #1271299,792,458from physics.nist.gov
    #835299,792,458from www.bipm.org
    #1924299,792,458from www.nist.gov
    #65299,792,458NIST Reference on Constants, Units, and Uncertainty (physics.nist.gov) — the speed of light in vacuum, c, is an exactly defined SI constant equal to 299792458 metres per second.
    #1207299,792,458from www.bipm.org
    #866299,792,458NIST — Fundamental Physical Constants: speed of light in vacuum, c = 299 792 458 m/s (exact, by SI definition of the metre)
    #1199299,792,458NIST Reference on Constants, Units, and Uncertainty (physics.nist.gov) — speed of light in vacuum, c = 299792458 m/s exactly, as defined by the SI.
    #328299,792,458BIPM (Bureau International des Poids et Mesures), SI Brochure (9th edition, 2019): the metre is defined by fixing the numerical value of the speed of light in vacuum, c, to be exactly 299792458 when expressed in units of m/s.
    #6299,792,458NIST CODATA / SI base unit definitions: physics.nist.gov/cgi-bin/cuu/Value?c — speed of light in vacuum, c = 299792458 m/s (exact, defining constant of the SI metre)
    #1514299,792,458from www.bipm.org
    #516299,792,458from physics.nist.gov
    #1759299,792,458from www.nist.gov
    #180299,792,458from www.nist.gov
    #1193299,792,458from www.nist.gov
    #671299,792,458from physics.nist.gov
    #1202299,792,458NIST Reference on Constants, Units, and Uncertainty (physics.nist.gov) and the BIPM SI Brochure, both stating c = 299792458 m/s exactly, as fixed by the 1983 redefinition of the metre.
    #1540299,792,458NIST fundamental physical constants (physics.nist.gov/cuu/Constants), corroborated by the BIPM SI Brochure, both stating the speed of light in vacuum is exactly 299792458 m/s by SI definition
    #363299,792,458NIST, "Speed of light" / CODATA fundamental physical constants (physics.nist.gov), which lists c = 299792458 m/s exactly, as fixed by the SI definition of the metre.
    #1471299,792,458NIST, 'Speed of Light, c' (physics.nist.gov/cgi-bin/cuu/Value?c), part of the CODATA/SI defining constants; the speed of light in vacuum is defined as exactly 299792458 m/s.
    #1860299,792,458NIST Reference on Constants, Units, and Uncertainty (physics.nist.gov) — speed of light in vacuum c = 299792458 m/s, exact by SI definition of the metre
    #1554299,792,458NIST CODATA / Fundamental Physical Constants listing for 'speed of light in vacuum' (c = 299792458 m/s, exact by definition), corroborated by the BIPM SI Brochure (9th edition, 2019) which defines the metre in terms of this exact value of c.
    #1626299,792,458from physics.nist.gov
    #863299,792,458from physics.nist.gov
    #1006299,792,458from www.nist.gov
    #1133299,792,458from www.nist.gov
    #1299299,792,458from physics.nist.gov
    #1561299,792,458NIST CODATA fundamental physical constants, physics.nist.gov/cgi-bin/cuu/Value?c (speed of light in vacuum, 299 792 458 m/s, exact)
    #1477299,792,458NIST, Fundamental Physical Constants (physics.nist.gov/cuu/Constants), speed of light in vacuum c = 299792458 m/s exactly, as fixed by the SI definition of the metre since the 2019 SI redefinition.
    #735299,792,458NIST, 'Speed of light in vacuum, c' (physics.nist.gov/cgi-bin/cuu/Value?c) and BIPM SI Brochure, 9th edition — both state the speed of light in vacuum is exactly 299,792,458 m/s, fixed by definition since the 1983 redefinition of the metre (retained in the 2019 SI redefinition).
    #760299,792,458from www.nist.gov
    #88299,792,458NIST CODATA fundamental physical constants (physics.nist.gov/cgi-bin/cuu/Value?c) and BIPM SI Brochure (9th edition), both stating c = 299792458 m/s exactly, as fixed by the 1983 CGPM redefinition of the metre.
    #777299,792,458from physics.nist.gov
    #1974299,792,458NIST 'Fundamental Physical Constants' (physics.nist.gov) and BIPM SI Brochure (9th edition), both stating c = 299792458 m/s exactly by definition of the SI metre
    #948299,792,458from www.nist.gov
    #1445299,792,458from www.bipm.org
    #29299,792,458NIST (physics.nist.gov), Speed of light in vacuum, c = 299792458 m/s exactly (SI definition since 2019 redefinition of the metre)
    #61299,792,458from physics.nist.gov
    #475299,792,458from physics.nist.gov
    #606299,792,458NIST CODATA / SI Brochure (BIPM): speed of light in vacuum c = 299792458 m/s exactly, as also stated in Encyclopaedia Britannica's article 'speed of light'.
    #1464299,792,458NIST (physics.nist.gov, 'fundamental physical constants' / SI base units) and BIPM SI Brochure 9th edition, cross-checked against Encyclopaedia Britannica
    #211299,792,458from www.bipm.org
    #1819299,792,458from www.bipm.org
    #812299,792,458from www.nist.gov
    #355299,792,458from physics.nist.gov
    #341299,792,458from physics.nist.gov
    #1678299,792,458NIST SI base units / CODATA reference (physics.nist.gov), corroborated by BIPM SI Brochure (bipm.org): speed of light in vacuum c = 299,792,458 m/s exactly, by definition of the metre.
    #528299,792,458from www.nist.gov
    #1311299,792,458from www.nist.gov
    #706299,792,458from physics.nist.gov
    #1506299,792,458from www.bipm.org
    #1530299,792,458from www.nist.gov
    #809299,792,458NIST CODATA Value: speed of light in vacuum c = 299 792 458 m/s (exact, SI definition)
    #5299,792,458from www.nist.gov
    #1731299,792,458from www.bipm.org
    #527299,792,458from physics.nist.gov
    #953299,792,458from www.nist.gov
    #1314299,792,458from physics.nist.gov
    #1254299,792,458NIST Fundamental Physical Constants (physics.nist.gov/cgi-bin/cuu/Value?c) and BIPM SI Brochure 9th edition, both stating the speed of light in vacuum is exactly 299792458 m/s by definition
    #912299,792,458NIST CODATA/SI reference for the defined value of the speed of light in vacuum (c = 299792458 m/s), corroborated by the BIPM SI Brochure definition of the metre.
    #212299,792,458from www.bipm.org
    #127299,792,458NIST (physics.nist.gov / CODATA) and BIPM SI Brochure: speed of light in vacuum c = 299792458 m/s exactly, a defining constant of the SI.
    #1168299,792,458from www.nist.gov
    #1871299,792,458NIST physical constants reference (physics.nist.gov) and the BIPM SI Brochure, both stating the speed of light in vacuum c = 299792458 m/s exactly, by SI definition.
    #559299,792,458from physics.nist.gov
    #842299,792,458from www.nist.gov
    #1606299,792,458from www.nist.gov
    #1656299,792,458from www.nist.gov
    #800299,792,458NIST Physical Measurement Laboratory / BIPM SI Brochure — speed of light in vacuum, c = 299792458 m/s exactly (defining constant of the SI)
    #708299,792,458NIST Reference on Constants, Units, and Uncertainty (physics.nist.gov) — speed of light in vacuum, exact SI-defined value c = 299792458 m/s
    #15299,792,458from www.bipm.org
    #351299,792,458NIST (National Institute of Standards and Technology), 'The NIST Reference on Constants, Units, and Uncertainty' / SI Brochure (BIPM), which states the speed of light in vacuum c = 299792458 m/s exactly, a defined constant since the 1983 redefinition of the metre.
    #1616299,792,458NIST CODATA Fundamental Physical Constants (physics.nist.gov/cgi-bin/cuu/Value?c), which lists the speed of light in vacuum as the exact defined value c = 299792458 m/s, consistent with the BIPM SI Brochure definition of the metre.
    #1581299,792,458from www.bipm.org
    #1927299,792,458from physics.nist.gov
    #1113299,792,458from www.bipm.org
    #1059299,792,458from physics.nist.gov
    #1890299,792,458NIST CODATA fundamental physical constants: speed of light in vacuum c = 299 792 458 m/s (exact, SI definition since 1983)
    #1032299,792,458NIST Reference on Constants, Units, and Uncertainty (physics.nist.gov) and the BIPM SI Brochure, both of which state that the speed of light in vacuum, c, is exactly 299792458 m/s by definition of the metre.
    #1763299,792,458Wikipedia, Speed of light (citing the SI definition, BIPM SI Brochure): c = 299,792,458 m/s exactly
    #729299,792,458from www.nist.gov
    #2299,792,458NIST, 'Speed of light' (physics.nist.gov / NIST reference on constants, units, and uncertainty), stating c = 299792458 m/s exactly, as fixed by the SI definition of the metre adopted by the CGPM in 1983 and carried forward in the 2019 SI redefinition.
    #1427299,792,458from www.bipm.org
    #880299,792,458from physics.nist.gov
    #66299,792,458from physics.nist.gov
    #281299,792,458from physics.nist.gov
    #1020299,792,458from www.bipm.org
    #1350299,792,458from www.bipm.org
    #1295299,792,458from www.bipm.org
    #595299,792,458NIST CODATA / physics.nist.gov fundamental constants listing, and the BIPM SI Brochure definition of the metre, both stating c = 299792458 m/s exactly
    #1735299,792,458NIST CODATA fundamental physical constants (physics.nist.gov/cgi-bin/cuu/Value?c) and BIPM SI defining constants (bipm.org/en/measurement-units/si-defining-constants)
    #131299,792,458NIST CODATA/SI reference (physics.nist.gov, constant 'speed of light in vacuum', value 299792458 m/s, exact by definition since the 1983 redefinition of the metre); corroborated by BIPM SI Brochure (9th edition)
    #724299,792,458from www.bipm.org
    #1980299,792,458from www.bipm.org
    #1965299,792,458from physics.nist.gov
    #783299,792,458from www.bipm.org
    #493299,792,458NIST - Fundamental Physical Constants: speed of light in vacuum, c = 299792458 m/s (exact, by SI definition); corroborated by Encyclopaedia Britannica's entry on the speed of light.
    #1725299,792,458NIST, 'Fundamental Physical Constants' (physics.nist.gov), speed of light in vacuum c = 299792458 m/s (exact, defining value)
    #1251299,792,458from www.bipm.org
    #1079299,792,458from www.bipm.org
    #1545299,792,458from physics.nist.gov
    #429299,792,458NIST — International System of Units (SI) reference on defining constants: speed of light in vacuum c = 299792458 m/s (exact)
    #759299,792,458from www.bipm.org
    #705299,792,458from www.bipm.org
    #174299,792,458from www.nist.gov
    #524299,792,458from www.bipm.org
    #153299,792,458NIST CODATA / BIPM SI Brochure: speed of light in vacuum c = 299,792,458 m/s exactly, by definition of the metre
    #823299,792,458NIST Reference on Constants, Units, and Uncertainty (physics.nist.gov) — CODATA value: speed of light in vacuum, c = 299792458 m/s (exact, by SI definition of the metre).
    #420299,792,458from www.bipm.org
    #1728299,792,458from physics.nist.gov
    #1401299,792,458NIST Fundamental Physical Constants (physics.nist.gov), corroborated by the BIPM SI Brochure definition of the metre
    #990299,792,458from physics.nist.gov
    #1086299,792,458from www.nist.gov
    #470299,792,458from physics.nist.gov
    #1505299,792,458NIST CODATA / BIPM SI Brochure (9th ed.): the speed of light in vacuum is defined exactly as c = 299,792,458 m/s, fixed by the 1983 redefinition of the metre.
    #294299,792,458NIST CODATA fundamental physical constants (physics.nist.gov/cgi-bin/cuu/Value?c) and the BIPM SI Brochure (bipm.org), both of which state the speed of light in vacuum is exactly 299,792,458 metres per second by definition of the SI metre.
    #1376299,792,458from physics.nist.gov
    #540299,792,458BIPM SI Brochure, 9th edition (2019) - defines c = 299792458 m/s exactly
    #849299,792,458from www.nist.gov
    #443299,792,458NIST Reference on Constants, Units, and Uncertainty (physics.nist.gov/cuu) and Encyclopaedia Britannica, 'speed of light' entry — both state c = 299,792,458 m/s exactly, the SI-defined value since the metre was redefined in terms of the fixed speed of light.
    #1548299,792,458from www.nist.gov
    #721299,792,458from www.nist.gov
    #1001299,792,458NIST Physical Reference Data / BIPM SI Brochure (9th edition): the speed of light in vacuum is exactly 299792458 metres per second, this being the fixed value used to define the metre in the International System of Units (SI).
    #605299,792,458BIPM (Bureau International des Poids et Mesures), The International System of Units (SI Brochure), 9th edition: the metre is defined by taking the fixed numerical value of the speed of light in vacuum, c, to be 299792458 when expressed in the unit m/s
    #166299,792,458NIST, Fundamental Physical Constants (physics.nist.gov/cuu/Constants) — speed of light in vacuum c = 299,792,458 m/s exactly, the defining value adopted by the 17th CGPM (1983) for the SI metre.
    #756299,792,458NIST CODATA / SI Brochure: speed of light in vacuum c = 299792458 m/s (exact, by definition of the metre)
    #1184299,792,458from www.nist.gov
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