Think of pH as a sourness or bitterness scale for liquids, running from 0 to 14. A 7 is neutral—like pure, boring water. Anything below 7 is acidic (think lemon juice, at a sharp pH of 2), and anything above 7 is basic (like baking soda water, around pH 9).
Now, here’s the kicker: Pure rain isn’t pure water. As it falls, it grabs carbon dioxide from the air, forming a very mild carbonic acid. This naturally makes clean rainwater slightly acidic—typically landing between a comfy 5.0 and 5.5 on our scale.
Wait, acid rain? Don’t panic! This is perfectly normal, and it’s been happening since the first cloud ever formed. It’s nature’s gentle way of keeping the world chemically balanced.
