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The metric system is 150 years old. The metre originated in the French Revolution, but its definition has changed many times since - ABC News https://www.abc.net.au/news/science/2025-05-20/metre-treaty-anniversary-met…

The metre originated in the French Revolution, but its definition has changed many times since
The next time you pick up a bag of spuds from the supermarket or fill up the car with petrol, you can thank a treaty signed in 1875 for the metric system that underpins daily life.