Why Is Compressed Air Cold Upside Down

Apr 28 2000 15 995 1 81.

Why is compressed air cold upside down.

Holding it upside down makes the pressure release faster because. 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. As you have noted this liquid quickly evaporates because is is a gas at room temperature. Turn that cup upside down and you get all that cold slurpee goodness.

Begingroup georg it s called compressed air but it s not actually 78 nitrogen. This same reason causes compressed air to feel cold as it expands and draws heat from its surroundings. A pocket of gas sits at the top of the can preventing liquid from spraying out when the can is right side up. When you turn the can upside down the liquid is forced out instead.

Gases compressed into liquids absorb much energy upon vaporization which is why under normal use the can becomes quite cold to the touch. Canned air is one of many inhalants that can be abused. Someone else may be able to explain it more accurately but i think that s the general idea. Turning the can upside down and spraying does not allow for the liquid to immediately vaporize and therefore turns the can into a freeze spray.

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. Similarly turn the can upside down and you re shooting out the liquid propellant instead. And when you have it down below it can not blow out. When compressed into the can this mixture takes fluid form.

When breathed in these gases can displace the oxygen in your lungs. Why does canned air get cold. 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. Jul 15 2003 9 physics.

In other words it begins to boil. 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.