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To be clear, a "liter" and a "litre" are the same unit of volume, just spelled differently. (It's not like "gallons", where the US and Imperial gallon have different volumes.)

I do not have any sources, but I'm pretty sure litre (or liter) is used very extensively, across the ocidental world at least, including Australia. What country are you from?

Yes, liter or litre is used across the world. 'Liter' is used only in the US I believe.

I'm pretty sure that the only time I use 'liter' is for soda pop. I'm from the US.

Liter is used very widely in Europe, at least in non-english languages.

Ah, such as? I assume it's litre in France, I think it's litro in Spanish..

I know about German [1], Slovak [2]

[1] https://www.duden.de/suchen/dudenonline/Liter

[2] http://slovniky.korpus.sk/?w=liter

I think it's the same in Slovenian, Hungarian, Serbian (litar?), Norwegian and Swedish.