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The Weights and Measures Family
 

Once there were seven artifacts in the weights and measures family.

Along with the kilogram, there was the candela, which measured luminous intensity, the kelvin (temperature), the metre (length), the ampere (electric current), the mole (substance) and the second (time).

Science has since quantified all other base units in terms of mathematical constants – leaving the kilogram as the only material “artifact” remaining in the current system of units.

Strangely it affects three of the base units of measure — the mole, ampere and candela which says NIST, are all linked to the weight of those 40 blocks of platinum-iridium.

 

The Kilo is Losing Weight


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