Something I’ve always been curious about – how do we keep units of measurement like centimeters, kilograms, seconds, etc the exact same over time? If we use measurement tools to create other measuring tools over the span of centuries, how do we prevent slight deviations from the original measurements in the long run? For example, when we measure a kilogram today, is that still the precise mass of the original kilogram?
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also in a vault there is a weight that is perfectly 1 Kilogram gram and that is also used to calibrate things.
.https://www.npr.org/templates/story/story.php?storyId=112003322
It can also be calculated using avogadro’s number and the molecular make up of an item.
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