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== History ==

{{Expand section|date=November 2010}}

The role of gastric acid in [[digestion]] was established in the 1820s and 1830s by [[William Beaumont]] on [[Alexis St. Martin]], who, as a result of an accident, had a [[fistula]] (hole) in his stomach, which allowed Beaumont to observe the process of digestion and to extract gastric acid, verifying that acid played a crucial role in digestion.<ref>{{cite book | last = Harré | first = R. | title = Great Scientific Experiments | publisher = Phaidon (Oxford) | year = 1981 | pages = 39&ndash;47 | isbn = 0-7148-2096-2 | authorlink = Rom Harré }}</ref>