wht,s the use of dry ice ?

Answer 1

Liquid and solid carbon dioxide are important refrigerants, especially in the food industry, where they are employed during the transportation and storage of ice cream and other frozen foods. Solid carbon dioxide is called "dry ice" and is used for small shipments where refrigeration equipment is not practical.

Carbon dioxide is used to produce carbonated soft drinks and soda water. Candy called Pop Rocks is pressurized with carbon dioxide gas at about 600 PSI. When you put the candy in your mouth, it dissolves (just like other hard candy) and releases the gas bubbles with an audible "pop". Traditionally, the carbonation in beer and sparkling wine comes about through natural fermentation, but some manufacturers carbonate these drinks artificially.


A carbon dioxide laser.The leavening agents used in baking produce carbon dioxide to cause dough to rise. Baker's yeast produces carbon dioxide by fermentation within the dough, while chemical leaveners such as baking powder and baking soda release carbon dioxide when heated or exposed to acids.

Carbon dioxide is often used as an inexpensive, nonflammable pressurized gas. Life jackets often contain canisters of pressured carbon dioxide for quick inflation. Steel capsules are also sold as supplies of compressed gas for airguns, paintball markers, for inflating bicycle tires, and for making seltzer. Rapid vaporization of liquid CO2 is used for blasting in coal mines.

Carbon dioxide is the most commonly used compressed gas for pneumatic systems in Combat Robots. Carbon dioxide is ideal for this application because at room temperature it becomes a liquid at a pressure of 60 bar. A tank of liquid carbon dioxide provides a constant 60 bar pressure until the tank is close to being empty. A tank of compressed air would gradually reduce in pressure as it was used.

Carbon dioxide extinguishes flames, and some fire extinguishers, especially those designed for electrical fires, contain liquid carbon dioxide under pressure. Carbon dioxide also finds use as an atmosphere for welding, although in the welding arc, it reacts to oxidize most metals. Use in the automotive industry is common despite significant evidence that welds made in carbon dioxide are brittler than those made in more inert atmospheres, and that such weld joints deteriorate over time because of the formation of carbonic acid. It is used as a welding gas primarily because it is much less expensive than more inert gases such as argon or helium.

Liquid carbon dioxide is a good solvent for many organic compounds, and is used to remove caffeine from coffee. First, the green coffee beans are soaked in water. The beans are placed in the top of a column seventy feet (21 metres) high. The carbon dioxide fluid at about 93 degrees Celsius enters at the bottom of the column. The caffeine diffuses out of the beans and into the carbon dioxide.

Carbon dioxide has begun to attract attention in the pharmaceutical and other chemical processing industries as a less toxic alternative to more traditional solvents such as organochlorides. It's used by some dry cleaners for this reason. (See green chemistry.)

Plants require carbon dioxide to conduct photosynthesis, and greenhouses may enrich their atmospheres with additional CO2 to boost plant growth. It has been proposed that carbon dioxide from power generation be bubbled into ponds to grow algae that could then be converted into biodiesel fuel[1]. High levels of carbon dioxide in the atmosphere effectively exterminate many pests. Greenhouses will raise the level of CO2 to 10,000 ppm (1%) for several hours to eliminate pests such as whiteflies, spider mites, and others.

In medicine, up to 5% carbon dioxide is added to pure oxygen for stimulation of breathing after apnea and to stabilize the O2/CO2 balance in blood.

A common type of industrial gas laser, the carbon dioxide laser, uses carbon dioxide as a medium.

Carbon dioxide can also be combined with limonene from orange peels or other epoxides to create polymers and plastics.

Carbon dioxide is commonly injected into or adjacent to producing oil wells. It will act as both a pressurizing agent and, when dissolved into the underground crude oil, will significantly reduce its viscosity, enabling the oil to flow more rapidly through the earth to the removal well. In mature oil fields, extensive pipe networks are used to carry the carbon dioxide to the injection points.

Answer 2

Sometimes you want things to keep cold without them getting wet.

If you put fish wrapped in paper in a cooler full of ice, the ice will melt and wreck the wrapping.

But dry ice, as it "melts", goes so quickly from a solid to a gas that it can't soak anything. It's also much colder than most water ice, so a smaller amount lasts as long.

Answer 3

Dry Ice is usually used in many ways as it melts very slowly
It is used to keep food cold For a long time

Answer 4

Dry Ice is frozen carbon dioxide. Unlike most solids, it does not melt into a liquid, but instead changes directly into a gas. This process is called sublimation. The temperature of dry ice is around -109° F! It melts very quickly so if you need dry ice for an experiment or project, buy it as close as possible to the time you need it.

The super-cold temperature and the sublimation feature of dry ice make it great for refrigeration. For example, if you want to send something frozen across the country, you can pack it in dry ice and it will be frozen when it reaches its destination. Also, because dry ice sublimates instead of melts like conventional ice there will be no messy liquid left over.

Other uses of Dry Ice:
Dry Ice's uses aren't limited to refrigeration. Listed below are some other typical, and not so typical uses of dry ice.

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Carbonating Drinks
When carbon dioxide is added to plain water it will make sparkling mineral water. Simply drop a couple of small pieces of dry ice into your drink and leave it to carbonate the drink. Be very careful not to swallow the dry ice!

Freeze Branding
Dry ice is perfect for Freeze Branding animals. The product 'Brandabull' uses a standard CO2 cylinder to produce dry-ice from a special gun. A digit-mould is filled with the dry-ice and then applied to the animal.

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Medical Uses
Doctors often use dry ice to freeze skin for wart removal. Many medical facilities also use dry ice to ship biological specimens for laboratory testing or further processing.
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Transporting Plants
Dry ice will keep flowers cool and delay blooming. Maintaining the temperature of plants at 34°F will retard blooming. You must be careful to not allow the dry ice to get too close and freeze the plants.
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Chemical retardant
The low temperature of dry ice slows or stops some chemical reactions. It is used to store and ship special adhesives It is also a neutralizing agent for alkalis.
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Dry ice blast cleaning
Dry ice blasting was developed as a safe, clean alternative to sand blasting, bead blasting, soda blasting, and hand scrubbing. It is used in many different industries, and is particularly useful for cleaning spills and in disaster recovery.

Trapping Mosquitoes
Mosquitoes are attracted to humans and animals by the C02 exhaled. A dry ice trap like the one shown can be used to attract and catch Mosquitos, this is particularly useful if you are having a barbeque outside and dont want to be annoyed by pesky mosquitos.

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Baking Industry
Dry ice is used in mixing ingredients and retarding yeast growth until the proper time.
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Science Experiments
There are heaps of exciting experiments you can try with dry ice!

Answer 5

dry ice
Carbon dioxide in solid form. It is a dense, colourless substance, resembling compressed snow, that at normal atmospheric pressure passes directly from solid to vapour (see sublimation) at −109.3 °F (−78.5 °C). Commonly available in blocks, it is used chiefly to keep foods, vaccines, and other perishable products cold during shipping or storage.

For more information on dry ice, visit Britannica.com.

Answer 6

Wet Ice is used forr cooling drinks....
Dry Ice is used for cooling DRy Drinks

Answer 7

Pack it in with fish or any food you need to ship a long distance and keep cold. Make a spooky thingy for halloween. Burn the $hit out of yourself on it.

Answer 8

to make something cold.

by the way, add dry ice to a bottle of water. close the bottle. and throw the bottle to a target and you got a potential osama bin laden weapon.

Answer 9

cooling something, for example, spread dry ice among the atmosphere so that the cooling the air accelarating it to rain.

Answer 10

To keep things cool and it doesn't get messy (like regular ice) when it melts, coz it just evaporates.

Answer 11

Ice cream plants sometimes sell them.