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+ - Standard Kilogram Gains Weight->

Submitted by mrbluze
mrbluze writes "The standard kilogram weights which are used by countries around the world for calibration have variably increased in mass by tens of micrograms. This poses a threat to the precision and comparability of measurements in science, engineering and trade. The problem is due to surface contamination, but a safe method of cleaning the weights has only recently been devised by the use of ozone and ultraviolet light."
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Standard Kilogram Gains Weight

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