It just occurred to me (on the can, i might add) that with the various states of matter all being driven by pressure, it might have necessary characteristics to be classified as one.
On a side note, I wonder what pressure the intestinal tract is rated for. I have a certain potato-based experiment I’d be interested to know the outcome of.
No, your farts are not what propel your poop. Squeezing and relaxing of the tube propels the poop, which is not a pneumatic process.