| http://www.w3.org/ns/prov#value | - How much air one swallows depends on many factors such as hurried eating without chewing the food properly (gulping the food!), talking a lot during meals, hyperventilation etc.Normally the upper esophageal sphincter is in closed mode to prevent atmospheric air entering the esophagus.It opens only while swallowing.During 'normal' belching, this sphincter opens and the gas in the stomach which is a
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