|MadSci Network: Chemistry|
I have searched the web (through 9 billion "e-tailers, that would love to sell me some), and the local library to no end for this answer. I asked a local science professor and he simply said "it's compressed air". I am just curious about the reaction you get when shaking the can, or better yet, the product you get when you spray it upside down. I am baffeled that no one seems to know what is actually in "canned air"!
Re: Why does canned air get cold when shaken?
Try the links in the MadSci Library for more information on Chemistry.