Holding in the fart makes it smell worse.
Farts are perhaps the internet’s favorite thing after cats. Be it videos of all sorts of animals farting to websites which contain hundreds of fart sounds, we enjoy farts. The composition and the science behind a fart is fairly simple but the humor associated with it is timeless. It is perhaps the sounds it makes or the fact that it can be used in various pranks. However, in high society, farts are considered ill mannered and only the past time of the uncouth. Consequently, a lot of people try to hold them in when in the company of a stranger or someone you respect or are trying to impress.
Though there are many theories concerning holding in farts. One says that you could fill yourself up with all that un-discharged gas and spontaneously combust. On a more serious note, however, holding in gas causes a set of problems. One being that the fart will get smellier by the minute the longer you hold it in. Farts consist of a number of gases like Oxygen, Hydrogen, Nitrogen, Methane etc. Most of these gases can be absorbed in the blood stream but nitrogen does not. The longer you hold a fart, the more nitrogen will collect in the fart and this makes it smellier. Besides this, doctors believe that holding in farts does not cause any problem besides a stomach ache.
http://www.whattheffacts.com/smell-of-fart/
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"The longer you hold a fart, the more nitrogen will collect in the fart and this makes it smellier. "
