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How Much Does a Kilogram Weigh?

Locked away in an underground Parisian vault, there is a very important and valuable piece of platinum-iridium alloy known as " ... . Instead, Le Grand K is the piece of metal, created in the 1880s, that is the current definition of how ... be to match the kilogram to known physical constants. For example, the meter is officially defined [suite...]

Date: 2008-02-28 20:25:28
Blog: Wired Science - Wired B...

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