what is Deposition, also known as desublimation, point of co2 is it room temperature? i dont think so then how can we obtain this at room temperature as in this video and what pressure is required to solidify co2,is it 1 atm ?i don't think so then how we obtain this in a room as in above mentioned video. i have searched a lot and came to know that The process is not at room temperature .The extinguisher contains liquid CO2 at room temperature and several atmospheres pressure. When it is discharged the pressure drops to one atmosphere and, as it falls, the liquid boils. The heat of vaporization greatly cools the expanding CO2 and it solidifies.is this much right?and i am still confused about pressure.When high pressure co2 liquid is discharged the pressure drops to one atmosphere ,but what is the pressure when co2 solidifies ?1 atm?how?