Why Is Compressed Air Cold Upside Down

Begingroup georg it s called compressed air but it s not actually 78 nitrogen.

Why is compressed air cold upside down.

Turn that cup upside down and you get all that cold slurpee goodness. The liquid which is sprayed while the can is upside down absorbs more heat as it changes from a liquid to a gas when sprayed. Because these gases are compressed to liquid form when you turn the can upside down and press the nozzle liquid will come out before it turns to gas. Jul 15 2003 9 physics.

Holding it upside down makes the pressure release faster because. When compressed into the can this mixture takes fluid form. When you turn the can upside down the liquid is forced out instead. The duster can is made so it will just take air out because the intake is at the top like trying to suck on a slurpee with the straw at the top of the cup.

Someone else may be able to explain it more accurately but i think that s the general idea. Since some of the gases are heavier than air when turned upside down the can will spray out the liquid mixture before it has had time to mix with the lighter gases. And when you have it down below it can not blow out. Canned air is one of many inhalants that can be abused.

Removing heat and making the can or nozzle cold. A pocket of gas sits at the top of the can preventing liquid from spraying out when the can is right side up. Similarly turn the can upside down and you re shooting out the liquid propellant instead. Apr 28 2000 15 995 1 81.

This same reason causes compressed air to feel cold as it expands and draws heat from its surroundings. As you have noted this liquid quickly evaporates because is is a gas at room temperature. In other words it begins to boil. When breathed in these gases can displace the oxygen in your lungs.

Jul 15 2003 4 the can freezes as the pressure inside is released. As for why it gets cold.