![Er Ashish K Singh on Twitter: "The kilogram is the SI base unit of mass and is equal to the mass of the international prototype of the kilogram , a platinum-iridium standard Er Ashish K Singh on Twitter: "The kilogram is the SI base unit of mass and is equal to the mass of the international prototype of the kilogram , a platinum-iridium standard](https://pbs.twimg.com/media/DaqJWYlX0AE85Eh.jpg)
Er Ashish K Singh on Twitter: "The kilogram is the SI base unit of mass and is equal to the mass of the international prototype of the kilogram , a platinum-iridium standard
![The Bureau of Weights and Measures: Balpe, Anne-Gaelle, Mahé, Vincent: 9780648009108: Amazon.com: Books The Bureau of Weights and Measures: Balpe, Anne-Gaelle, Mahé, Vincent: 9780648009108: Amazon.com: Books](https://m.media-amazon.com/images/W/IMAGERENDERING_521856-T1/images/I/61Lp7y908rL._AC_UF1000,1000_QL80_.jpg)
The Bureau of Weights and Measures: Balpe, Anne-Gaelle, Mahé, Vincent: 9780648009108: Amazon.com: Books
![The International Bureau of Weights and Measures, Sevres, France - Historic Images - NIST Digital Archives The International Bureau of Weights and Measures, Sevres, France - Historic Images - NIST Digital Archives](https://nistdigitalarchives.contentdm.oclc.org/digital/api/singleitem/image/p16009coll19/249/default.jpg)
The International Bureau of Weights and Measures, Sevres, France - Historic Images - NIST Digital Archives
![International Bureau of Weights and Measures (BIPM) has decided that the kilogram will no longer be pegged to this cylinder made of 90% platinum and 10% iridium. International Bureau of Weights and Measures (BIPM) has decided that the kilogram will no longer be pegged to this cylinder made of 90% platinum and 10% iridium.](https://vajiramandravi.s3.us-east-1.amazonaws.com/media/2018/12/22/9/9/24/252525.jpg)