World Metrology Day 2019

E287420

international observance scientific commemoration

World Metrology Day 2019 marked the global celebration of the historic redefinition of the International System of Units (SI), when several base units were newly defined in terms of fundamental physical constants.

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All labels observed (1)

Label	Occurrences
World Metrology Day 2019 canonical	1

How this entity was disambiguated

This entity first appeared as the object of triple T2683535 — resolving that mention is where its identity was fixed. The disambiguator weighed these candidate entities and picked the highlighted one (or “None”, minting a new entity). This is how homonymy is resolved: the same surface form can point to different entities.

NED1 Entity disambiguation (via context triple) gpt-5-mini-2025-08-07

Target entity: World Metrology Day 2019
Context triple: [26th General Conference on Weights and Measures, effectiveDateOfNewDefinitions, World Metrology Day 2019]

A. World Meteorological Day
World Meteorological Day is an annual global observance held on 23 March to highlight the importance of weather, climate, and water services and to commemorate the founding of the World Meteorological Organization.
B. 26th General Conference on Weights and Measures
The 26th General Conference on Weights and Measures was the 2018 international meeting where member states adopted a landmark revision of the SI, redefining several base units in terms of fundamental physical constants.
C. International System of Units
The International System of Units is the globally accepted standard for measurement, defining a coherent set of base and derived units used in science, industry, and everyday life.
D. National Science Day in India
National Science Day in India is an annual observance on 28 February celebrating scientific achievements and promoting science awareness, centered on the legacy of physicist C. V. Raman and his discovery of the Raman effect.
E. International Bureau of Weights and Measures
The International Bureau of Weights and Measures is an international organization that maintains the global system of units (SI) and ensures worldwide uniformity of measurements and time standards.
F. None of above. chosen
G. Unsure - the case is ambiguous/there is not enough information to decide.

NED2 Entity disambiguation (via description) gpt-5-mini-2025-08-07

Target entity: World Metrology Day 2019
Target entity description: World Metrology Day 2019 marked the global celebration of the historic redefinition of the International System of Units (SI), when several base units were newly defined in terms of fundamental physical constants.

A. World Meteorological Day
World Meteorological Day is an annual global observance held on 23 March to highlight the importance of weather, climate, and water services and to commemorate the founding of the World Meteorological Organization.
B. 26th General Conference on Weights and Measures
The 26th General Conference on Weights and Measures was the 2018 international meeting where member states adopted a landmark revision of the SI, redefining several base units in terms of fundamental physical constants.
C. International System of Units
The International System of Units is the globally accepted standard for measurement, defining a coherent set of base and derived units used in science, industry, and everyday life.
D. National Science Day in India
National Science Day in India is an annual observance on 28 February celebrating scientific achievements and promoting science awareness, centered on the legacy of physicist C. V. Raman and his discovery of the Raman effect.
E. International Bureau of Weights and Measures
The International Bureau of Weights and Measures is an international organization that maintains the global system of units (SI) and ensures worldwide uniformity of measurements and time standards.
F. None of above. chosen

Statements (33)

Predicate	Object
instanceOf	international observance ⓘ scientific commemoration ⓘ
aimsTo	inform stakeholders about the new SI definitions ⓘ raise awareness of the importance of accurate and reliable measurement ⓘ
associatedWith	BIPM ⓘ linked to: International Bureau of Weights and Measures OIML ⓘ linked to: International Organization of Legal Metrology national metrology institutes ⓘ
celebratedIn	many countries worldwide ⓘ
commemorates	redefinition of SI base units in terms of fundamental physical constants ⓘ redefinition of the International System of Units ⓘ
date	2019-05-20 ⓘ
focusesOn	measurement standards ⓘ metrology ⓘ
follows	World Metrology Day 2018 ⓘ
hasOfficialWebsite	https://www.worldmetrologyday.org/2019 ⓘ
hasTheme	The International System of Units – Fundamentally better ⓘ linked to: International System of Units
highlights	definition of the ampere via the elementary charge ⓘ definition of the kelvin via the Boltzmann constant ⓘ definition of the kilogram via the Planck constant ⓘ definition of the mole via the Avogadro constant ⓘ
languageOfOfficialMaterial	English ⓘ French ⓘ
marks	entry into force of the revised SI adopted in 2018 ⓘ global transition to constant-based definitions of SI units ⓘ
organizedBy	International Bureau of Weights and Measures ⓘ International Organization of Legal Metrology ⓘ
partOf	annual World Metrology Day observance ⓘ
precedes	World Metrology Day 2020 ⓘ
relatedTo	International System of Units ⓘ SI base units ⓘ fundamental physical constants ⓘ
subjectOf	conferences and seminars on new SI definitions ⓘ public outreach activities on the SI redefinition ⓘ

How these facts were elicited

Referenced by (1)

Full triples — surface form annotated when it differs from this entity's canonical label.

26th General Conference on Weights and Measures → effectiveDateOfNewDefinitions → World Metrology Day 2019 ⓘ

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Statements (33)

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Referenced by (1)

How this entity was disambiguated

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