What do you call fizzy drinks/soda/carbohydrate drinks in Japanese?
炭酸飲料（たんさんいんりょう） seems too formal . What word should I use for soda in a conversation? Do I say ソーダ or ジューン?

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I think 炭酸 is the word that most people say in dairy life. 
I often say 炭酸 like 炭酸飲みたい！

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私も知りたい。サイダーと呼ばれることもあるね。

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Some people just say 炭酸, which makes sence if you are not talking in the lab but at the grocery.