When is a kilogram not a kilogram?
June 15, 2007 8:56 AM Subscribe
Scientists will use perfect silicon spheres to determine how many silicon atoms make up a kilogram, and this will be used as the new international prototype — bringing the kilogram into line with other base units such as the meter. The current international prototype, a lump of platinum and iridium, is securely tucked away inside a French vault.
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