Acids are part of everyday life. As a street term, “acid” refers to lysergic acid diethylamide or LSD, an illegal drug. Other acids are more benign. Open a can of soda pop or beer, and the little “pshtt” sound indicates that carbonic acid has just started to separate into water and carbon dioxide. When it’s opened to the atmosphere, carbonic acid releases CO2 in the form of little bubbles.