Lightin' a fart (really!)

Here’s one from “The Nephew Files”:
What is the difference between the gas we pass by burping and the gas by pass by farting? You can ignite a fart, but you can’t ignite a burp, what are the differences between the two? Thanks: DJ (Drollman’s Nephew!) :slight_smile:

I think that a burp is usually air. Read that somewhere. :wink:
Peace,
mangeorge

Cecil has covered this indirectly: http://www.straightdope.com/classics/a1_079.html

Note that two of the gasses that make up a fart are flamable. And this is probably where mangeorge read about belches being mostly air.