I am using some Dust Off brand cans to clean out a computer after an accident with concrete dust... long story.

Inside one of these cans is a flurocarbon which quickly turns into a gas at room temperature. It is not ordinary air as that would be too difficult or expensive to store compressed.

Anyway, I noticed that when orientated with the spray head upwards, the stuff which exited the nozzle was mostly vaporised immediately with a small amount of liquid residue. However, when orientated downwards some kind of liquid which quickly froze exited the nozzle. In fact such ice is still frozen on my computer case and is slowly melting.

What causes the two distinct states? And why does the frozen stuff that sprays out upside down take ages to melt, but the frozen stuff which exits when orientated upwards melts, and subsequently evaporates very quickly?