The human body expels
gas on average 14 -
23 times per day totalling about 2 pints in
volume, most commonly as a
burp. The air which isn't expelled by
belching travels from the
stomach to the
intestines. Some of the gas is absorbed and some more is created by the further
digestion of food. What remains is expelled through the
anus.
Gas is generally made up of
carbon dioxide,
oxygen,
nitrogen, and sometimes
methane. Only about 1/3 of people produce
methane -- to figure out if you're part of the 33% nation, look at your
poopies. in general, do they float? congratulations, you make
methane! This doesn't mean your
farts smell any more than the other 66% of the world --
methane is odorless. The
smell is caused by
bacteria.
reference: www.onhealth.com