I am a confused (and somewhat anal retentive) non-chemist who is trying to understand what pH is. I have come to understand it is a measure of acidity, but I have not yet figured out what that means to a precision that I find satisfying.
Please excuse me if these are dumb questions, but they will help me understand the definition:
Does everything have a pH? What is the scale that pH works upon? Does a proton have a pH? A quark? Does the sun have a pH? Does the Universe?