The scientific world just experienced one of the biggest shake-ups in the history of measurement. The definitions of the seven base units of the SI (AKA the International System of Units) are now completely different from a week ago. Here's what you need to know.
We measure stuff all the time – how long, how heavy, how hot and so on – because we need to for things such as trade, health and knowledge. But making sure our measurements compare apples with apples has been a challenge: how to know if my kilogram weight or metre length is the same as yours?
Attempts have been made to define the units of measurement over the years. But as of last week, a complete revision of those standards have come into play.
You won’t notice anything – you will not be heavier or lighter than yesterday – because the transition has been made to be seamless.
Just the definitions of the seven base units of the SI (Système International d'Unités, or the International System of Units) are now completely different from yesterday.
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