Originally posted by: Howard
Originally posted by: MagicianBdotCom
My friend, got sprayed by his friend VERY bad once. His whole forearm was burned and all the skin peeled off and such. It was disgusting. He was a weird kid and so he'd always show it off and stuff just to freak people out. It took like the whole school year to heal and it still looks gross where it healed 'cause it's all scarred up. Do those cans have warning things on them?? Why does it happen when you flip the can?
Aerosol cans use a highly compressed gas as propellant. When positioned right-side-up, the liquid is at the bottom and the gas is at the top. A tube from the top to the bottom of the can is sealed by a valve, which is opened when you push on the button at the top. The gas exerts pressure on the liquid, and the liquid goes up the tube to be aerosolized when it exits the nozzle.
When you flip it, the gas is at the top, and it goes out the tube when you push the button. Because it's at room temperature and very high pressure, when it comes out, it'll be at normal pressure and very low temperature (gas law).