國際單位制（SI）—根本性飛躍

The SI - Fundamentally better

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 coherent measurement system worldwide 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 2019 is The International System of Units - Fundamentally better. This theme was chosen because on 16 November 2018, the General Conference on Weights and Measures agreed perhaps one of the most significant revisions to the International System of Units (the SI) since its inception. Research into new measurement methods, including those using quantum phenomena, underpin the change. The SI is now based on a set of definitions each linked to the laws of physics and have the advantage of being able to embrace further improvements in measurement science and technology to meet the needs of future users for many years to come.

Across the world, national metrology institutes continually advance measurement science by developing and validating new measurement techniques at whatever level of sophistication is needed. The national metrology institutes participate in comparisons coordinated by the Bureau International des Poids et Mesures (BIPM) to ensure the reliability of measurement results worldwide. The BIPM also provides a forum for its Member States to address new measurement challenges. The International Organization of Legal Metrology (OIML) develops International Recommendations, the aim of which is to align and harmonize requirements worldwide in many fields.

World Metrology Day recognizes and celebrates the contribution of all the people that work in intergovernmental and national organizations throughout the year on behalf of all.

 關于“世界計量日”__________

世界計量日是一年一度的活動。這一天，80多個國家舉辦慶祝活動，宣傳計量對我們日常生活的影響。
　　之所以選擇這個日子，是為了紀念《米制公約》在1875年5月20日簽署，這也標志著國際計量合作的正式開始。每年的世界計量日慶?；顒佑擅字乒s組織和國際法制計量組織聯合組織舉辦，各國計量機構參與其中。
　　國際計量界致力于確保全球范圍內準確測量活動的開展，通過每年世界計量日海報及網站的宣傳來增強公眾對計量的認識。以往世界計量日的主題包括計量與全球能源挑戰、計量與安全、計量與創新，以及體育中的計量、環境中的計量、醫療和貿易中的計量等。

關于米制公約組織（BIPM）___________

1875年簽署的《米制公約》創立了BIPM，正式開啟了國際計量合作?！睹字乒s》為各個測量領域量值的全球統一奠定了基礎。歷史上，計量主要關注并支持工業和貿易領域。但是，氣候變化、健康、能源等21世紀人類亟需解決的重大挑戰領域，也成為了計量關注的焦點。BIPM對選取的部分物理、化學量值開展最高層次的科學研究。BIPM將各國的國家計量院聯系起來，是世界計量網絡的核心與中樞。各國的國家計量院通過可溯源至SI的溯源鏈向各認證認可實驗室和工業界傳遞量值，從而保證各國測量量值對SI的溯源性。

關于國際法制計量組織（OIML）____________

1955年，國際法制計量組織作為一個政府間締約組織成立。國際法制計量局（BIML）是該組織的秘書處和總部。OIML和BIML旨在促進全球法制計量規則的協調一致。自成立以來，OIML的首要目的是建立全球范圍內適用的技術框架，以協調各國國家計量部門或相關組織采用的計量法規和計量管理的一致性。