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Discover Ludwig"metric system" is correct and usable in written English.
It is used to refer to a system of measurement based on the meter, the kilogram, and the liter. For example: "In many countries, the metric system is the standard system of measurement."
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Don't you just love the metric system?
Who keeps the metric system down?
Yeah, that worked out so well with the metric system.
It is even, somehow, "like the metric system".
He also pulled off a joke about the metric system.
Mathematics – Create a poster explaining the metric system.
If he starts using the metric system, I'm done.
It's a movie about an algorithm, a metric system.
"Oh, you have the metric system in Europe.
(The relevant chapter in our math book was called something like "Oh, No! The Metric System!") But the metric system is neither new nor a failure.
James described his racing broom" – and explains why wizards don't need the metric system.
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com