How did the metric system determine what the base units (gram, liter, meter, etc) would be based on, and how do they interrelate? - Quora
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Progress Towards the Establishment of Various Redefinitions of SI Unit “ Metre” at CSIR-National Physical Laboratory- India and its Realization | SpringerLink
![The International Bureau of Weights and Measures (BIPM) at Sèvres made 31 prototype line standards of platinum - 10 percent iridium alloy. These have Stock Photo - Alamy The International Bureau of Weights and Measures (BIPM) at Sèvres made 31 prototype line standards of platinum - 10 percent iridium alloy. These have Stock Photo - Alamy](https://c8.alamy.com/comp/2ABA2R9/the-international-bureau-of-weights-and-measures-bipm-at-svres-made-31-prototype-line-standards-of-platinum-10-percent-iridium-alloy-these-have-2ABA2R9.jpg)