Why Is Compressed Air Cold Upside Down

A pocket of gas sits at the top of the can preventing liquid from spraying out when the can is right side up.

Why is compressed air cold upside down. 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. 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. Begingroup georg it s called compressed air but it s not actually 78 nitrogen. When you turn the can upside down the liquid is forced out instead.

Apr 28 2000 15 995 1 81. Similarly turn the can upside down and you re shooting out the liquid propellant instead. Jul 15 2003 9 physics. In other words it begins to boil.

Why does canned air get cold. As you have noted this liquid quickly evaporates because is is a gas at room temperature. 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. 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 for why it gets cold. Canned air is one of many inhalants that can be abused. When compressed into the can this mixture takes fluid form.

Jul 15 2003 4 the can freezes as the pressure inside is released. Gases compressed into liquids absorb much energy upon vaporization which is why under normal use the can becomes quite cold to the touch. 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. Turn that cup upside down and you get all that cold slurpee goodness.

This same reason causes compressed air to feel cold as it expands and draws heat from its surroundings. Removing heat and making the can or nozzle cold.