In chemistry, a pure substance has a fixed chemical composition. Distilled water is 100% H₂O—no other elements or compounds mixed in. That makes it a pure compound.
Now, don’t confuse “pure” with “perfect.” Pure doesn’t mean magical. It just means it’s all one kind of molecule. And that’s exactly what distilled water is.
Bottled Distilled Water Mixture Or Pure Substance at William Fetters blog
But wait—why does it feel like this answer is too easy? Because sometimes people mix up the word “pure” with “natural.” And that’s where things get fun.
