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It proposed a new, but completely equivalent, wording of the metre's definition: "The metre, symbol m, is the unit of length; its magnitude is set by fixing the numerical value of the speed of light in vacuum to be equal to exactly 299 792 458 when it is expressed in the SI unit m s −1."
speed of light (in vacuum) 299,792,458 meters per second (m/s) speed of sound: meter per second (m/s) specific heat capacity: joule per kilogram per kelvin (J⋅kg −1 ⋅K −1) viscous damping coefficient kilogram per second (kg/s) electric displacement field also called the electric flux density coulomb per square meter (C/m 2)
The periods of the waves of visible light have a duration of about 2 femtoseconds. λ c = 600 × 10 − 9 m 3 × 10 8 m s − 1 = 2.0 × 10 − 15 s {\displaystyle {\lambda \over {c}}={600\times 10^{-9}~{\rm {m}} \over 3\times 10^{8}~{\rm {m}}~{\rm {s}}^{-1}}=2.0\times 10^{-15}~{\rm {s}}} The precise duration depends on the energy of the ...
(The reason for the change was an improved method of measuring the speed of light.) The speed of light could then be expressed exactly as c 0 = 299 792 458 m/s, a standard also adopted by the IERS numerical standards. [19] From this definition and the 2009 IAU standard, the time for light to traverse an astronomical unit is found to be τ A ...
Exponentiation with base 10 is used in scientific notation to denote large or small numbers. For instance, 299 792 458 m/s (the speed of light in vacuum, in metres per second) can be written as 2.997 924 58 × 10 8 m/s and then approximated as 2.998 × 10 8 m/s. SI prefixes based on powers of 10 are also used to describe small or large quantities.
To help compare different orders of magnitude, the following list describes various speed levels between approximately 2.2 × 10 −18 m/s and 3.0 × 10 8 m/s (the speed of light). Values in bold are exact.
ft/s 3.2808 The metre per second is the unit of both speed (a scalar quantity ) and velocity (a vector quantity , which has direction and magnitude) in the International System of Units (SI), equal to the speed of a body covering a distance of one metre in a time of one second .
c is the speed of light (299 792 458 m⋅s −1 [8]); ε 0 is the electric constant ( 8.854 187 8188 (14) × 10 −12 F⋅m −1 [ 9 ] ). Since the 2019 revision of the SI , the only quantity in this list that does not have an exact value in SI units is the electric constant (vacuum permittivity).