The way we define kilograms, metres and seconds changes today
- Written by David Brynn Hibbert, Emeritus Professor of Analytical Chemistry, UNSW
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...
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