Why is argon used in a light bulb instead of air?

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The filament lasts for a long time because argon is inert and will not oxidize the filament even at high temperatures.
If air were used, the oxygen would quickly react with and destroy the hot filament within seconds of it being turned on.

Quick experiment: Attach a wire to the positive and negative sides of a large flashlight battery (the large rectangular ones with the two coils coming from the top... I can't think of the proper size). Attach the back of one alligator clip to the open end of each wire (so the clip part is not clipped on the wire). String out some steel wool until you have a single strand (or two or three wound together). This essentially is a light bulb filament. Clip it into the two alligator clips and watch how fast it burns.
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Why is argon used for light bulbs?

Argon is an inert gas that will not support burning when the bulbs filament becomes white hot because of the current running through it. When a light bulb consists of tungsten, when electricity is passed through it, tungsten offers a very high resistance and it becomes hot and produces white light. At this temperature when it is exposed to air, tungsten gets oxidized. So prevent its oxidation, tungsten is burnt in the atmosphere of argon, which is a inert gas.

Why are light bulbs filled with argon?

Light bulbs are filled with argon AND nitrogen because they don't burn up the light bulb as quickly. It take a high tempertaure in a light bulb to create the light. The heat in the light bulb then causes chemical reactions. If there was just air in a light bulb, then the element would quickly react with the oxidize (oxygen) and burn out the light bulb. Now, with the light bulb filled with argon and some nitrogen because in the high temperature, the chemical reacts with these elements much more slowly, therefore keeping the light bulb lit longer. Incandescent light bulbs heat a tungsten filament to extremely high temperatures. At such temperatures ordinary air would rapidly oxidize the filament and the bulb would burn out in seconds. Instead the bulbs are filled with argon, which is inert and will not react with the tungsten under any conditions. Argon is frequently used when an inert atmosphere is needed. It is used to fill incandescent and fluorescent light bulbs to prevent oxygen from corroding the hot filament. Argon is also used to form inert atmospheres for arc welding, growing semiconductor crystals and processes that require shielding from other atmospheric gases. Because a radioactive form of argon is produced by decay of a naturally occurring radioactive potassium isotope. It is an inert gas and so completely inactive to heat. As a result it does not change into any other compound or burn in the presence of excessive heat produced in the light bulb due to passage of current through tungsten wire. Argon is a noble gas, which means it is inert (unreactive). Air however contains around 20% oxygen. If the bulb is filled with air, the atmospheric oxygen will oxidise the filament. this then cause it to not shine so brightly/not shine. The oxygen can also cause the filament to burn, making the bulb dangerous. Therefore, Argon provides an inert atmosphere to prevent the above from happening. If I remember correctly, if air was used, the filament would burn extremely fast, only giving about three seconds of light before the filament is completely burnt up (or all the oxygen in the bulb has oxidized). Quick experiment: Attach a wire to the positive and negative sides of a large flashlight battery (the large rectangular ones with the two coils coming from the top... I can't think of the proper size). Attach the back of one alligator clip to the open end of each wire (so the clip part is not clipped on the wire). String out some steel wool until you have a single strand (or two or three wound together). This essentially is a light bulb filament. Clip it into the two alligator clips and watch how fast it burns.

In a bulb a noble gas argon is used why is argon used instead of air in the light bulb?

Argon can be used in bulbs much like neon can; where neon gives off a reddish-orange light, argon is a bluish tint.. If argon is used in an incandescent bulb it's probably to protect the filament from oxygen in the air. However, I'm not sure this is ever actually done; I know nitrogen is sometimes used for this purpose, but using argon seems to be overkill.

Can a light bulb work with just oxygen instead of argon?

No. Light bulb filaments become extremely hot when in use, and oxygen, which is highly reactive, would cause the filament to burn away in a matter of seconds. Argon is used because it is inert, and thus will not react with the filament.

What property of argon is used in light bulbs?

Its chemical unreactivity. Argon, along with helium, neon, krypton, xenon and radon are the noble gases. Because their outer shells are completely filled with electrons, they never react with any other atoms in nature. Therefore in a light bulb filled with argon the hot tungsten filament will not corrode as it would if air were present. Oxygen in the air would react with the hot tungsten, essentially rusting it and causing the bulb to fail. Xenon, krypton and possibly helium can be made to react only under extreme laboratory conditions. A chemist won the Nobel prize for doing this in the 1960's. But neon and argon have never been made to react at all. Argon is used in bulbs rather than the other noble gases because it is abundant and therefore inexpensive. Ordinary air is about 1% argon, 21% oxygen and 78% nitrogen. Argon can also be used to fill the air space in partially drunk bottles of wine. The wine will then not react with oxygen and go sour.