Its because the HCL acid which we have in our stomach is very much diluted due to water........
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Though HCl is a strong acid it becomes diluted in our stomach because we contain alot of water in our body/stomach and also mucus is secreted by the gastric glands which prevents HCl to a result the walls of the stomach won't be hurted/digested by HCl. Hope this helps.pls mark as brainliest....
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