5月20日为世界计量日，是1875年签署《米制公约》的周年纪念日。《米制公约》为建立全球协调一致的计量体系奠定了基础，为科学发现与创新、工业制造、国际贸易，乃至生活质量提升和全球环境保护提供支撑。
2020年世界计量日的主题是“测量支撑全球贸易”。该主题旨在提高人们对测量的认识，了解测量在促进全球公平贸易、确保产品合标合规，以及满足顾客质量期望中所起到的重要作用。
纵观全球，各国国家计量院致力于通过开发和验证各种复杂尖端的新测量技术，持续推动测量科学进步。同时，积极参加国际计量局（BIPM）组织协调的测量领域国际比对，以确保测量结果全球可靠。
国际法制计量组织（OIML）制定“国际建议”，旨在实现多领域相关要求的全球一致性和协调性，并通过实施国际法制计量组织证书互认制度（OIML-CS），促进法制管理的计量器具的国际互认和全球贸易。
这些国际计量体系为测量的准确性提供了必要的保证和信心，为当今的全球贸易奠定了坚实基础，并帮助我们为应对未来挑战做好准备。
世界计量日代表所有人肯定和颂扬所有工作在政府间组织和各国家机构中的人们一年来为计量所做的贡献。
关于“世界计量日”
世界计量日是一个年度性的活动，全球80多个国家在此期间庆祝计量对我们日常生活的影响。
1875年5月20日《米制公约》的签署，标志着全球计量领域合作的正式开启。这一天也因此被定为世界计量日，以表纪念。每年，国际计量局（BIPM）和国际法制计量组织（OIML）联合举办世界计量日活动，各国国家计量机构参与。
国际计量界致力于确保全球测量结果的准确性，在每个世界计量日都以海报和网站的宣传形式提高大众对计量的认识。以往世界计量日的主题包括：计量与全球能源挑战，计量与安全，计量与创新，以及动态世界中的计量，环境、医学、贸易中的测量等。
关于国际计量局
1875年《米制公约》的签署，正式开启了计量的国际合作，并创建了国际计量局（BIPM），为建立全方位的全球统一的测量奠定基础。历史上，测量重点关注和支持工业和贸易发展，现在，它与应对气候变化、健康和能源等21世纪重大挑战一样至关重要。BIPM选取某些特定物理量和化学量开展最高水平的科学工作，同时它也是一个由各国国家计量院（NMIs）联结而成的全球计量网络的枢纽。通过这一网络，BIPM在世界范围内建立起溯源到SI的溯源链，并向各国认可实验室和工业界传递。
关于国际法制计量组织
1955年，国际法制计量组织（OIML）成立。作为一个政府间组织，它致力于促进法制计量规则的全球统一，其秘书处和总部是国际法制计量局（BIML）。自成立以来，OIML建立了一个全球性的技术架构，目的在于协调各国国家计量部门或相关组织采用的计量法规和计量管理的一致性。
May 20 is World Metrology Day, commemorating the anniversary of the signing of the Metre Convention in 1875. This treaty provides the basis for a worldwide coherent measurement system that underpins scientific discovery and innovation, industrial manufacturing and international trade, as well as the improvement of the quality of life and the protection of the global environment.
The theme for World Metrology Day 2020 is Measurements for global trade. This theme was chosen to create awareness of the important role measurement plays in facilitating fair global trade, ensuring products meet standards and regulations, and satisfying customer quality expectations.
Across the world, national metrology institutes continually advance measurement science by developing and validating new measurement techniques at the necessary level of sophistication. The national metrology institutes participate in measurement comparisons coordinated by the Bureau International des Poids et Mesures (BIPM) to ensure the reliability of measurement results worldwide.
The International Organization of Legal Metrology (OIML) develops International Recommendations, which aim to align and harmonise requirements worldwide in many fields. The OIML also operates the OIML Certification System (OIML-CS) which facilitates international acceptance and global trade of regulated measuring instruments.
These international metrology systems provide the necessary assurance and confidence that measurements are accurate, providing a sound basis for global trade today and helping us to prepare for the challenges of tomorrow.
World Metrology Day recognises and celebrates the contribution of all the people that work in intergovernmental and national metrology organisations and institutes throughout the year.
Notes for Editors:
World Metrology Day is an annual event during which more than 80 countries celebrate the impact of measurement on our daily lives.
This date was chosen in recognition of the signing of the Metre Convention on 20 May 1875, the beginning of formal international collaboration in metrology. Each year World Metrology Day is organised and celebrated jointly by the International Bureau of Weights and Measures (BIPM) and the International Organization of Legal Metrology (OIML) with the participation of the national organisations responsible for metrology.
The international metrology community which works to ensure that accurate measurements can be made across the world endeavours to raise awareness each World Metrology Day through a poster campaign and web site. Previous themes have included topics such as measurements for the global energy challenge, for safety, for innovation, and measurements in sport, the environment, medicine and trade.
About the BIPM
The signing of the Metre Convention in 1875 created the BIPM and for the first time formalised international cooperation in metrology. The Convention established the International Bureau of Weights and Measures and laid the foundations for worldwide uniformity of measurement in all aspects of our endeavours, historically focusing on and assisting industry and trade, but today just as vital as we tackle the grand challenges of the 21st Century such as climate change, health, and energy. The BIPM undertakes scientific work at the highest level on a selected set of physical and chemical quantities. The BIPM is the hub of a worldwide network of national metrology institutes (NMIs) which continue to realise and disseminate the chain of traceability to the SI into national accredited laboratories and industry.
About the OIML
In 1955 the International Organization of Legal Metrology (OIML) was established as an Intergovernmental Treaty Organisation in order to promote the global harmonisation of legal metrology procedures with the Bureau International de Métrologie Légale (BIML) as the Secretariat and Headquarters of the OIML. Since that time, the OIML has developed a worldwide technical structure whose primary aim is to harmonise the regulations and metrological controls applied by the national metrological services, or related organisations.