I just bought a compressed air duster, and i flipped it upside down when i was spraying it, and some liquid came out, onto my hand. It was extremely cold. So i looked on the can to see what the liquid was, apparently it was Difluoroethane. http://en.wikipedia.org/wiki/Difluoroethane Aparently very cold, and is also known as Freon 152a. If you made a completely sealed liquid system with a brushless motor pump (the vapors are flammable), and made sure everything was airtight, you could make your system very cool, and overclock very high.