Flatulence is the expulsion of bowel gas (or flatus) from the anal canal.
The average individual expels a wide range of volume of flatus per day, ~200-2500 mL 1.
The bulk of the volume of the gas comprises oxygen, nitrogen, carbon dioxide, hydrogen, and methane. However these gases lack any associated odor. The odiferous components are from trace concentrations of other gases. These gases primarily consist of sulfur compounds including hydrogen sulfide, methanethiol, and dimethyl sulfide 1.
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