the.com/acidity
The chemistry of sour, where molecules can't stop donating protons they never wanted.
means The quality of being acidic — having a low pH and a sharp, sour character, whether in lemons, soil, or your stomach.
from From Latin acidus, meaning sour or sharp, rooted in acere, to be sour — same family as acrid and the very edge of vinegar.
pH scaleEach step is tenfold; lemon dwarfs coffee.
Stomach acidStrong enough to dissolve metal, kindly doesn't.
Coffee tastingAcidity means bright and lively, not sour.
Ocean troubleCarbon dioxide is quietly souring the seas.