Why does gas sometimes make a noise when it is being passed and sometimes the process is quiet but poisonous?
Cultural constrains have a major influence on noise. In most societies audible flatus is not socially acceptable. In general there is more noise from a larger volume of gas. The "pitch" depends on the diameter of the anal canal. A narrow opening produces a higher pitched squeal than a relaxed anal canal. Sitting, especially on a toilet, tends to produce a louder explosion than when standing. Hemorrhoids do not alter the pitch or intensity of the sound. Most people are aware, by the time they are of school age if they are a baritone or a soprano.
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