Hi nrtyx. I don’t work with chemicals either, but I do recall that the pH scale is logarithmic. That means that each change of 1 on the pH scale away from 7 means an actual increase of 10 times the strength of acid (down to 0) or alkali (up to 14).
So the strongest acids would have a pH of less than 1. A strong acid will break down water releasing hydrogen ions (H+) into solution. Ollie’s mentioned something about the acids he uses in the lab, and that looks like it’s about the same pH as the acid in your stomach that helps digest your food.