It is normal.
The noises in flatulence are caused by the vibration of the anal sphincter and the expulsion of gas through the rectum. The pitch and volume of the noise can vary depending on the amount of gas present and the tightness of the sphincter.
Random Expulsion of Gas
There is no medical term for that phenomenon.
Fart Gas
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Nitrogen
Put a cork in your anus to stop the gas flow.
Gas is passed this way through the anus.
When? Whenever it can. From where? Mouth, anus, and skin. Lung.
The least prominent gas in the atmosphere is xenon. It represents no more than one percent on the air in the atmosphere.
A volcano will is generally a prominent feature that stays in one place. Monitoring seismic activity, gas emissions, and shifts in the surface on and near a volcano can be used to determine if an eruption is likely.
It is from you having passed gas earlier and there are fecal particles stuck on the inner rim of your anus.