But it doesn’t matter, it has been replaced with the Kibble balance. The Kibble balance operated by the US National Institute of Standards and Technology. Credit: NIST Of course, it may or may not be a step forward. Read more about it here in the article on The Atlantic: https://www.theverge.com/2018/11/13/18087002/kilogram-new-definition-kg-metric-unit-ipk-measurement. Why isn’t this necessarily a…… Continue reading The IPK is Actually Older Than I Am!