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Reproducibility of experimental results is central to the scientific method. To facilitate this we need standards, and to get convenient measures of the standards we need systems of units. |
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Reproducibility? of experimental results is central to the scientific method. To facilitate this we need standards, and to get convenient measures of the standards we need systems of units. |
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The standards are defined by operational definitions. |
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The standards are defined by [operational definition]?s. |
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The quantities length, time and mass are central to the physical sciences. |
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The quantities length, time and mass are central to the [physical sciences]?. (See also physical unit) |
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: The SI unit of length is metre. One metre is defined as the distance light travels in a vacuum in 1/299792458 second. This standard was adopted in 1983, when the speed of light in vacuum was defined to be precisely 299792458 m/s. |
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: The SI unit of length is the metre. One metre is defined as the distance? light travels in a vacuum in 1/299792458 second. This standard was adopted in 1983, when the speed of light in vacuum was defined to be precisely 299792458 m/s. |
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: The SI unit of time is second. One second is defined as the time required for 9192631770 cycles of a hyperfine transition in cesium 133. This definition was adopted in 1967. |
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: The SI unit of time is the second. One second is defined as the time required for 9192631770 cycles of a [hyperfine transition]? in cesium 133. This definition was adopted in 1967. |
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: The SI unit of mass is kilogram. One kilogram is defined to be the mass of a specific cylinder of platinum-iridium alloy, kept at the International Bureau of Weights and Measures (near Paris). |
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: The SI unit of mass is the kilogram. One kilogram is defined to be the mass of a specific cylinder of platinum-iridium alloy, kept at the International Bureau of Weights and Measures (near Paris). |
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The most widely used system of units in science is the SI units. See also: physical unit |
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The most widely used system of units in science is the SI units (Système international). |
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