Why Is Compressed Air Cold Upside Down

Jul 15 2003 4 the can freezes as the pressure inside is released.

Why is compressed air cold upside down.

Begingroup georg it s called compressed air but it s not actually 78 nitrogen. 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. And when you have it down below it can not blow out.

In other words it begins to boil. Similarly turn the can upside down and you re shooting out the liquid propellant instead. When you turn the can upside down the liquid is forced out instead. 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.

Apr 28 2000 15 995 1 81. 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. When breathed in these gases can displace the oxygen in your lungs. This same reason causes compressed air to feel cold as it expands and draws heat from its surroundings.

Gases compressed into liquids absorb much energy upon vaporization which is why under normal use the can becomes quite cold to the touch. Jul 15 2003 9 physics. As for why it gets cold. Why does canned air get cold.

As you have noted this liquid quickly evaporates because is is a gas at room temperature. Canned air is one of many inhalants that can be abused. 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. Holding it upside down makes the pressure release faster because.

When compressed into the can this mixture takes fluid form. A pocket of gas sits at the top of the can preventing liquid from spraying out when the can is right side up.