Belching of gas

Japanese: おくび（英語表記）belching of gas

Also known as burping, or colloquially as burping. This is the phenomenon in which gas in the stomach (usually air) refluxes out of the body through the mouth. When swallowing, a small amount of air enters the stomach, and when not in a recumbent position, it mainly accumulates in the fundus of the stomach (this is called a stomach bubble). Normally, intragastric pressure is about 10 mmHg higher than intraesophageal pressure, but because the lower esophageal sphincter contracts to tightly close the esophageal outlet, no reflux from the stomach to the esophagus occurs. As food is ingested and the stomach becomes full, intragastric pressure rises, but at the same time, the contraction of the sphincter also becomes stronger, so no reflux occurs.

Source: Heibonsha World Encyclopedia, 2nd Edition Information

Japanese:

噯気（あいき），または俗にげっぷともいう。胃内の気体(通常は空気)が口腔を経て体外に逆流する現象。嚥下（えんげ）にともなって若干の空気が胃内に入り，臥位以外ではおもに胃底部に貯留する(これを胃泡stomach bubbleという)。ふつう胃内圧は食道内圧より約10mmHg高いが，下部食道括約筋が収縮して食道出口をしっかり閉じているので胃から食道への逆流はおこらない。食物を摂取して胃が充満していくにつれて胃内圧は上昇するが，同時に上記括約筋の収縮も強くなるので逆流は生じない。

出典　株式会社平凡社世界大百科事典第２版について　情報

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