Matches in DBpedia 2015-10 for { <http://dbpedia.org/resource/Proposed_redefinition_of_SI_base_units> ?p ?o }
- Proposed_redefinition_of_SI_base_units abstract "A committee of the International Committee for Weights and Measures (CIPM) has proposed revised formal definitions of the SI base units, which are being examined by the CIPM and which will likely be adopted at the 26th General Conference on Weights and Measures in the fall of 2018. The metric system was originally conceived as a system of measurement that was derivable from nature. When the metric system was first introduced in France in 1799 technical problems necessitated the use of artifacts such as the prototype metre and kilogram. In 1960 the metre was redefined in terms of the wavelength of light from a specified source, making it derivable from nature, leaving the kilogram as the only unit still defined by an artifact. If the proposed redefinition is accepted, the metric system (SI) will, for the first time, be wholly derivable from nature.The proposal can be summarised as follows:"There will still be the same seven base units (second, metre, kilogram, ampere, kelvin, mole, and candela). Of these, the kilogram, ampere, kelvin and mole will be redefined by choosing exact numerical values for the Planck constant, the elementary electric charge, the Boltzmann constant, and the Avogadro constant, respectively. The second, metre and candela are already defined by physical constants and it is only necessary to edit their present definitions. The new definitions will improve the SI without changing the size of any units, thus ensuring continuity with present measurements."Further details are found in the draft chapter of the Ninth SI Units Brochure.The last major overhaul of the metric system was in 1960 when the International System of Units (SI) was formally published as a coherent set of units of measure. SI is structured around seven base units that have apparently "arbitrary" definitions and another twenty units that are derived from these base units. Although the units themselves form a coherent system, the definitions do not. The proposal before the CIPM seeks to remedy this by using the fundamental quantities of nature as the basis for deriving the base units. This will mean, amongst other things, that the prototype kilogram will cease to be used as the definitive replica of the kilogram. The second and the metre are already defined in such a manner.A number of authors have published criticisms of the revised definitions — in particular that proposal had failed to address the impact of breaking the link between the mole and the kilogram, the dalton and the unified atomic mass unit, and the Avogadro constant and Avogadro's number.".
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- Proposed_redefinition_of_SI_base_units wikiPageExternalLink si_brochure_8_en.pdf.
- Proposed_redefinition_of_SI_base_units wikiPageExternalLink new_si.
- Proposed_redefinition_of_SI_base_units wikiPageExternalLink discussion_meeting.html.
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- Proposed_redefinition_of_SI_base_units wikiPageWikiLink Acta_Physica_Polonica.
- Proposed_redefinition_of_SI_base_units wikiPageWikiLink Amount_of_substance.
- Proposed_redefinition_of_SI_base_units wikiPageWikiLink Ampere.
- Proposed_redefinition_of_SI_base_units wikiPageWikiLink Atom.
- Proposed_redefinition_of_SI_base_units wikiPageWikiLink Atomic_mass_unit.
- Proposed_redefinition_of_SI_base_units wikiPageWikiLink Average.
- Proposed_redefinition_of_SI_base_units wikiPageWikiLink Avogadro_constant.
- Proposed_redefinition_of_SI_base_units wikiPageWikiLink Avogadro_number.
- Proposed_redefinition_of_SI_base_units wikiPageWikiLink Avogadro_project.
- Proposed_redefinition_of_SI_base_units wikiPageWikiLink BIPM.
- Proposed_redefinition_of_SI_base_units wikiPageWikiLink Barley.
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- Proposed_redefinition_of_SI_base_units wikiPageWikiLink CODATA.
- Proposed_redefinition_of_SI_base_units wikiPageWikiLink Caesium.
- Proposed_redefinition_of_SI_base_units wikiPageWikiLink Caesium-133.
- Proposed_redefinition_of_SI_base_units wikiPageWikiLink Candela.
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- Proposed_redefinition_of_SI_base_units wikiPageWikiLink Category:SI_units.
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- Proposed_redefinition_of_SI_base_units wikiPageWikiLink Coherence_(units_of_measurement).
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- Proposed_redefinition_of_SI_base_units wikiPageWikiLink Committee_on_Data_for_Science_and_Technology.
- Proposed_redefinition_of_SI_base_units wikiPageWikiLink Commonwealth_Scientific_and_Industrial_Research_Organisation.
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- Proposed_redefinition_of_SI_base_units wikiPageWikiLink Cultural_artifact.
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- Proposed_redefinition_of_SI_base_units wikiPageWikiLink Delegate.
- Proposed_redefinition_of_SI_base_units wikiPageWikiLink Dimensional_analysis.
- Proposed_redefinition_of_SI_base_units wikiPageWikiLink Earths_rotation.
- Proposed_redefinition_of_SI_base_units wikiPageWikiLink Edward_II.
- Proposed_redefinition_of_SI_base_units wikiPageWikiLink Edward_II_of_England.
- Proposed_redefinition_of_SI_base_units wikiPageWikiLink Electric_current.
- Proposed_redefinition_of_SI_base_units wikiPageWikiLink Electron.
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- Proposed_redefinition_of_SI_base_units wikiPageWikiLink Elementary_particle.
- Proposed_redefinition_of_SI_base_units wikiPageWikiLink Faraday_constant.
- Proposed_redefinition_of_SI_base_units wikiPageWikiLink Force.
- Proposed_redefinition_of_SI_base_units wikiPageWikiLink Formalism_(mathematics).
- Proposed_redefinition_of_SI_base_units wikiPageWikiLink French_Revolution.
- Proposed_redefinition_of_SI_base_units wikiPageWikiLink Frequency.
- Proposed_redefinition_of_SI_base_units wikiPageWikiLink Gas_constant.
- Proposed_redefinition_of_SI_base_units wikiPageWikiLink General_Conference_on_Weights_and_Measures.
- Proposed_redefinition_of_SI_base_units wikiPageWikiLink Gravitational_constant.
- Proposed_redefinition_of_SI_base_units wikiPageWikiLink Ground_state.
- Proposed_redefinition_of_SI_base_units wikiPageWikiLink Hertz.
- Proposed_redefinition_of_SI_base_units wikiPageWikiLink History_of_the_metre.
- Proposed_redefinition_of_SI_base_units wikiPageWikiLink Hyperfine_splitting.
- Proposed_redefinition_of_SI_base_units wikiPageWikiLink Hyperfine_structure.
- Proposed_redefinition_of_SI_base_units wikiPageWikiLink Hz.
- Proposed_redefinition_of_SI_base_units wikiPageWikiLink Impedance_of_free_space.
- Proposed_redefinition_of_SI_base_units wikiPageWikiLink Inch.
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- Proposed_redefinition_of_SI_base_units wikiPageWikiLink International_Prototype_Kilogram.
- Proposed_redefinition_of_SI_base_units wikiPageWikiLink International_System_of_Units.
- Proposed_redefinition_of_SI_base_units wikiPageWikiLink International_Union_of_Pure_and_Applied_Physics.
- Proposed_redefinition_of_SI_base_units wikiPageWikiLink International_vocabulary_of_metrology.
- Proposed_redefinition_of_SI_base_units wikiPageWikiLink Ion.
- Proposed_redefinition_of_SI_base_units wikiPageWikiLink Isotopes_of_caesium.
- Proposed_redefinition_of_SI_base_units wikiPageWikiLink Isotopes_of_silicon.
- Proposed_redefinition_of_SI_base_units wikiPageWikiLink Johnson_Matthey.
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- Proposed_redefinition_of_SI_base_units wikiPageWikiLink Kelvin.
- Proposed_redefinition_of_SI_base_units wikiPageWikiLink Kilogram.
- Proposed_redefinition_of_SI_base_units wikiPageWikiLink Latin_America.
- Proposed_redefinition_of_SI_base_units wikiPageWikiLink Light.
- Proposed_redefinition_of_SI_base_units wikiPageWikiLink List_of_natural_phenomena.
- Proposed_redefinition_of_SI_base_units wikiPageWikiLink Logic.
- Proposed_redefinition_of_SI_base_units wikiPageWikiLink Lumen_(unit).
- Proposed_redefinition_of_SI_base_units wikiPageWikiLink Luminosity.
- Proposed_redefinition_of_SI_base_units wikiPageWikiLink Luminous_efficacy.
- Proposed_redefinition_of_SI_base_units wikiPageWikiLink Luminous_intensity.
- Proposed_redefinition_of_SI_base_units wikiPageWikiLink Macroscopic_scale.
- Proposed_redefinition_of_SI_base_units wikiPageWikiLink Magnetic_flux_quantum.
- Proposed_redefinition_of_SI_base_units wikiPageWikiLink Measurement_uncertainty.
- Proposed_redefinition_of_SI_base_units wikiPageWikiLink Mercury_(element).
- Proposed_redefinition_of_SI_base_units wikiPageWikiLink Metre.
- Proposed_redefinition_of_SI_base_units wikiPageWikiLink Metre_Convention.
- Proposed_redefinition_of_SI_base_units wikiPageWikiLink Metre_per_second.
- Proposed_redefinition_of_SI_base_units wikiPageWikiLink Metrologia.
- Proposed_redefinition_of_SI_base_units wikiPageWikiLink Metrology.