solid carbon dioxide isnt ice. why is it called "dry ice"?

Answer 1

its called dry ice because it resembles ice, but carbon dioxide does not exist in liquid form, it sublimes straight from a solid to a gas. Hence "Dry Ice"

Answer 2

Solid State Of Carbon Dioxide

Answer 3

Solid Carbon Dioxide

Answer 4

Dry ice is a name given to carbon dioxide when it is at solid state. It sublimes meaning it doesn't melt, but rather evaporates from solid state to gasous state. The reason for this is because it is below it's own triple point, which is at -56.4 C and 5.11 atmospheres.

So if the temperature and pressure is above the carbon dioxide triple point, it will no longer sublime but melt and turn to liquid state. For comparison, water's triple point is at .0098 C and 0.00603 atmospheres. So ice would sublime just like dry ice below it's triple point.

Note: Normal Pressure is at 1 atmosphere, which is at sea level. And a triple point is where all three states of matter exist simultaneously.

Answer 5

This Site Might Help You.

RE:
solid carbon dioxide isnt ice. why is it called "dry ice"?

Answer 6

I take two exception to the answers given regarding the safety of "dry ice"

1. Dry ice, even encapsulated in frozen punch, is quite cold and
could stick to a child's tongue or roof of the mouth, causing a nasty freeze burn.
2. If an encapsulated chuck of dry ice were accidentally swallowed intact. It could mean a trip to the emergency room for gastrointestinal freeze burns and of course: PV=nRT


Dry Ice dries the skin and causes cold burn due lack of moisture and cold temperarure, hence name Dry Ice.

You can BUILD YOUR OWN COMET using dry ice.

Answer 7

Solid CO2

Dry ice
Dry ice is a genericized trademark for solid (frozen) carbon dioxide. The term was made in 1925 by Prest Air Devices, founded in Long Island City, New York in 1923.[1] The name refers to the fact that under normal atmospheric pressure, solid CO2 sublimates, or changes directly into a gas without passing through a wet liquid phase. As a general rule, dry ice will sublimate at a rate of five to ten pounds every 24 hours in a typical ice chest.

Dry ice is produced by compressing carbon dioxide gas to a liquid form, removing the heat produced by the compression (see Charles's law), and then letting the liquid carbon dioxide expand quickly. This expansion and the high-speed evaporation of carbon dioxide gas cools the remainder of the liquid down to the melting point, where some of the CO2 freezes into 'snow,' which is then compressed into pellets or blocks. The freezing point of CO2 is -109.3 °F or -78.5 °C.

Dry ice has many industrial uses, including


Dry ice used to cool drinks in Central Park.
Cooling foodstuffs, biological samples, and other perishable items, particularly for shipment.
Producing dry ice fog for special effects. When dry ice is put into contact with water vapour particles, the frozen carbon dioxide sublimates into a mixture of cold carbon dioxide gas and cold humid air. This causes condensation and the formation of fog .The use of warm water speeds up sublimation and leads to more vigorous production of fog.
Tiny pellets of dry ice are shot at a surface to be cleaned. Dry ice is not as hard as sand, but it speeds processing by sublimating to a gas and does not produce nearly as much lung-damaging dust.
Increasing precipitation from existing clouds or decreasing cloud thickness by cloud seeding.
Producing carbon dioxide gas as needed in such systems as the fuel tank inerting system in the B-47 Stratojet aircraft.
Brass or other metallic bushings are buried in dry ice to shrink them so they will fit inside a machined hole. When the bushing warms back up, it expands and makes an extremely tight fit.
As a cooling supplement for high power output computer central processing units or other types of hardware. Typically used by hobbyists when performing overclocking.
A rudimentary cloud chamber can be built using dry ice to supercool alcohol vapor.
Dry ice requires special precautions when handling. It is cold enough to cause frostbite injury if handled without gloves. It constantly produces carbon dioxide gas, so it cannot be stored in a light duty sealed container as the pressure buildup will quickly cause the container to explode (see dry ice bomb). The sublimated gas must be ventilated; otherwise, it may fill the enclosed space and create a suffocation hazard. Special care for ventilating vehicles is needed as well because of the small space. People who handle dry ice should also be aware that carbon dioxide is more dense than air and will sink to the floor. Some markets require those purchasing dry ice to be 18 years of age or older.

Answer 8

CO2 has no liquid form at normal pressures. The solid sublimates to gaseous form directly. Because it has no liquid form it can't be wet to the touch, like ice is, yet it looks like ice. Hence, dry ice.

Answer 9

because it does not melt but directly changes into gas by the process of sublimation.

Answer 10

It is cold like ice but dry because it will not melt.