A step closer to an atomic-based kilogram?(new standard for weight measure under development)(Brief Article)

Science News | September 26, 1998| | Copyright

Among global standards for length, mass, time, and other fundamental quantities, only the kilogram remains a physical object--a carefully machined cylinder of platinum-iridium alloy at the International Bureau of Weights and Measures at Sevres, France.

Because the cylinder collects dust and in other ways slightly changes mass with age--and might be lost or stolen--the stewards of the world's measurement system are eagerly seeking a new standard based on a carbon atom's mass or other fixed quantity of the atomic world (SN: 9/24/94, p. 199; 1/28/95, p. 63).

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