Incandescent Lamp Filament in Vacuum Chamber
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- Опубликовано: 4 окт 2024
- I put a tungsten filament from an incandescent light bulb in a vacuum chamber and turn it on. As soon as I let the air into the chamber the tungsten is oxidized (WO3) and broken.
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Well, that's why the filament is placed in a vacuum, at least in some incandescent lamps. But I suspect that the lamp shown here is partially filled with argon gas, which prevents much of the evaporation of the tungsten filament that we'd have if there was only a vacuum. This is important because the evaporated tungsten forms a black deposit on the inner surface of the glass bulb. We use argon for the job because its molecules are light and non-reactive and thus do not tend to cool the filament as convection currents circulate them through the bulb. (Nitrogen works too, for some applications, and many small lamps use a vacuum. The reasons are complex.)
Once air is introduced into the lamp the oxygen causes the filament to oxidize very rapidly, which causes it to burn up. Your toaster, however, runs at a far cooler temperature and can thus operate without much oxidation for many years.
Thank you for showing us this! Finally, someone who understands that people ought to understand the basics!
Great experiment, but if you check it with different vacuum value does it make difference in amper while you using the same source of voltage and check the light power of the the lamp . Thanks
congratulation you are the only one who made that in real!🎉🎉🎉🎉😊😊
Amazing Music when he turned on the bulb
Bruh that's from a game
Can you try a naked filament underwater?
12v car bulb has beefy contacts.
Then try if you can achieve the leidenfrost effect with the filament submerged
Thank you i was looking for this info
would have been interesting to see the vacuum released very slowly and how long the filament would have lasted in a gentle environment...
right?? lmao
is it theoretically possible to 'fix' lightbulbs that are designed with obsolescence? I assume they make light burn out by not adding enough argon gas and producing a weaker vacuum. In theory an incandescent lightbulb should be able to go forever, right?
1- you should see the bulb ( the broken bulb) into the normal environment,and then see it in the vacuum,to make clear the difference. 2- second ,the vacuum chamber was not totally vacuum, because when the light was on the filament flow some steam ( little,steam) ,so you should activate the vacuum pump simultaneously, to see the real vacuum. Do you try with electric heater ? What will happen ?
Wow this is cool
Yes kerbal space program music
How long does your filament last if you don't open the vent valve? What vacuum pressure are you operating at? In my experiment I pumped down to 35 milliTorr and my bulb lasts 60 seconds before burning out. I expected it should last hundreds of hours. I also get a blue residue all over, as seen in your video. At atmospheric pressure the filament lasts < 2 sec and gives a white residue localized to a very small area.
His mechanical vacuum pump can't provide an adequate vacuum for long filament life. That's why incandescent lamps could not be produced prior to the invention of better vacuum. pumps. Residues are probably condensed metal-oxide vapors.
It's not about the vacuum. Incandescent bulbs do not necessarily need a vacuum to operate. Instead they use an inert gas, like argon, which doesn't react with the tungsten filament, even when it is heated. The slight partial vacuum they have is so that the heat can be dispersed efficiently, and keep the bulb's glass from overheating. The reason it your fillaments are failing, is due to the tungsten's reaction with the small amount of oxygen left in the chamber. If you replaced the gas with an inert gas, it would operate normally.
QUESTION: what happens if you put the complete bulb in a vacuum chamber , will the glass envelope shatter ? like wise what about a flourscent tube
What happen to electric heater in vacuum? Will it increase the temperature or decrease it? Will it heat easily or with difficult in vacuum ?
great,
how much vacuum do we need to tungsten doesn't oxidize?
How does oxidization or rusting happen in a vacuum chamber or does it?
There is no oxidation if oxygen is not present.
Does the actual lit up Lamp Filament have electricity in it? can it shock you if you touch it?
Yes and yes. It will also deliver a shock after it has burned up.
It will probably burn you before it shocks you though.
Wow!!!! Me encanta!!!!
Add a copper pipe to the filament and make a low watt frying pan
The filament is over 3000celsius
I read the filament reaches 5000 fahrenheit
I'd like to know if you sealed a piece of copper to the jar one part touching rhe filament and another exposesd and touched the filament if the exposed part would be 5000 fahrenheit
Copper would melt and then vaporize at that temperature. That's why we use either tungsten or carbon for filaments.
Ese video le pertenece a CIENCIABIT
Soy el mismo. Es la versión internacional no en español
Jejeje disculpa profesor,desconocia su nuevo canal.
@@andresballesteros8694 De echo, este canal es más antiguo que el canal principal.
A caray! Disculpen la ignorancia jeje
thats why is stars shine, there, is, no, air up there...
1 cells has been damaged In the making of this video
can anyone explan in an easy way for me ? please
At high temperature the tungsten of the filament of the lamp reacts with oxygen in the air and oxidizes so it is destroyed. Light bulbs must be in a vaccum or with an inert gas like argon.
@@tinkerbit tungsten burns in CO2
see vacuum is better than neon or argon
Hola Nacho!!!!
0:50 Snow!