First, both drinks get their fizz from carbon dioxide gas. That’s the same gas that makes soda explode when you shake it. The difference comes down to what else is in the water.
Think of it like this: seltzer is the minimalist of bubbles. It’s pure water with added carbon dioxide. Nothing else.
Sparkling water? It’s the fancy cousin. It gets its fizz from the source—a natural spring. That means it carries along minerals like calcium, magnesium, or potassium.
The Taste Test: Why Your Tongue Knows
Why does sparkling water taste smoother? Because of those minerals. They soften the bite of the bubbles.
Seltzer is aggressive. It’s loud and sharp. It feels like tiny needles popping on your tongue.
Sparkling water is polite. It’s bubbly but gentle. It whispers, “I’m elegant,” while seltzer screams, “I’m just soda without the sugar.”
