Argon
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Transcript of Argon
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Argon
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• Argon is a chemical element represented by the symbol Ar.
• Argon has atomic number 18 and is the third element in group 18 of the periodic table (noble gases).
• Argon is the third most common gas in the Earth's atmosphere, at 0.93%, making it more common than carbon dioxide.
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This is argon!!
• Argon is colorless, odorless, and nontoxic as a solid, liquid, and gas.
• Argon is inert under most conditions and forms no confirmed stable compounds at room temperature.
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Why is argon used?
There are several different reasons why argon is used in particular applications:
• An inert gas is needed. In particular, argon is the cheapest alternative when diatomic nitrogen is not sufficiently inert.
• Low thermal conductivity is required.• The bulk of argon applications arise simply
because it is inert and relatively cheap.
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Applications
• Argon is used in some high-temperature industrial processes, where ordinarily non-reactive substances become reactive. For example, an argon atmosphere is used in graphite electric furnaces to prevent the graphite from burning.
• Argon is used in various types of metal inert gas welding such as tungsten inert gas welding.
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Semiconductor field
• An argon atmosphere is also used for growing crystals of silicon and germanium.•Argon is an asphyxiant in the poultry industry, either for mass culling following disease outbreaks.•As a means of slaughter more humane than the electric bath. •Its non-reactive nature makes it suitable in a food product, and since it replaces oxygen within the dead bird, argon also enhances shelf life
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• Argon is sometimes used for extinguishing fires where damage to equipment is to be avoided .
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• Argon is used to displace oxygen- and moisture-containing air in packaging material to extend the shelf-lives of the contents.
• Aerial oxidation, hydrolysis, and other chemical reactions which degrade the products are retarded or prevented entirely.
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A sample of caesium is packed under argon to avoid reactions with air
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Medical use
• Cryosurgery procedures such as cryoablation use liquefied argon to destroy cancer cells.
• Blue argon lasers are used in surgery to weld arteries, destroy tumours , and to correct eye defects destroy cancer cells.
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LIGHTING • Incandescent lights are filled with argon, to
preserve the filaments at high temperature from oxidation.
• Argon is used for the creation of blue laser light.
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Safety
• Although argon is non-toxic, it does not satisfy the body's need for oxygen and is thus an asphyxiant.
• Argon is 25% more dense than air and is considered highly dangerous in closed areas.
• It is also difficult to detect because it is colourless, odourless, and tasteless.
• In confined spaces, it is known to result in death due to asphyxiation.
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