Depends on what you've been eating, your stomach bacteria whether you've been ingesting air etc.watching a program about how cow farts are affecting global warming due to methane gas! I actually asked my chemistry teacher why our farts are flammable (tryed and tested due to south park!) she said methane....
QI answered, it's hydrogen!
Nitrogen 20 to 90%
Hydrogen 0 to 50% (flammable).
Carbon Dioxide 10 to 30%
Oxygen 0 to 10%
Methane 0 to 10 % (flammable).
With cows it's 20 to 30 gallons of methane per day per cow, though 90% is from the mouth.
This is a problem in Global warming.


