Standard Kilogram Needs Trimming
How do you define one kilogram? Easy: it's the exact mass of a metal cylinder called the International Prototype Kilogram, IPK for short, kept in controlled conditions in France. But the standard kilogram has gained weight since its creation in 1875. To trim it and its many replicas down to size, we need to clean them. The report is in the journal Metrologia...
« Last Edit: January 16, 2013, 01:40:03 AM by Asteriktos »
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