Author Topic: What can I do with an LPS arctube?  (Read 1494 times)
LightbulbManiac
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What can I do with an LPS arctube? « on: May 04, 2024, 08:54:57 AM » Author: LightbulbManiac
Yesterday an unused UK-made 90W SLP Sylvania LPS with a very damaged outer jacket was given to me for free from a store,
and I removed the tube from the cracked, (lost vacuum and missing pieces) outer jacket.
The tube itself still has vacuum and glows. Any ideas what should I do with it?
(For example, should I have it running like a decorative neon tube or just have it around for experiments like tesla coils etc.)?
Any ideas?  :wndr: :a_sox:
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LightsAreBright27
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Re: What can I do with an LPS arctube? « Reply #1 on: May 06, 2024, 02:03:30 AM » Author: LightsAreBright27
If you hook it up to a neon sign transformer, it will glow deep red (neon) or sometimes purple (argon). You can use it as a decoration, moodlight or nightlight based on brightness.
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AngryHorse
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Re: What can I do with an LPS arctube? « Reply #2 on: May 09, 2024, 05:59:00 AM » Author: AngryHorse
The problem here is how stupid hot they get  :o, I once ran a 90watt SOX tube outside on a concrete flag, I ran it for about 2 hours, then dumped it into a bucket of cold water just to see what would happen?
The resulting explosion set off next doors car alarm, a blew shards of red hot glass into my leg!  :poof:

I really wouldn’t advise running it out of its jacket to be honest?,
Speaking from experience!  8;)
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Rommie
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Re: What can I do with an LPS arctube? « Reply #3 on: May 09, 2024, 11:36:55 AM » Author: Rommie
@ Rich: Oops...  :poof:
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Rommie
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Re: What can I do with an LPS arctube? « Reply #4 on: May 09, 2024, 01:10:54 PM » Author: Rommie
Photon knows what to do with these..! One time we were there he blew up an EOL 90W lamp where one of the electrodes had detached and was rattling around inside the arc tube. Not only did it go bang and catch fire but the ceramic lampholder was destroyed as well  :poof:  :mrg:
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Laurens
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Re: What can I do with an LPS arctube? « Reply #5 on: May 10, 2024, 05:28:31 AM » Author: Laurens
That's not completely unexpected, heh. The glass will burst because of the thermal shock. Then the sodium will condense because of the return to atmospheric pressure. Then the near boiling hot mist of sodium droplets will react with the water. BANG!

At work we sometimes throw a chunk of solid sodium into the canal outside our school. It's spectacular and a much sharper detonation than common firecrackers.
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Mandolin Girl
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Re: What can I do with an LPS arctube? « Reply #6 on: May 10, 2024, 01:47:08 PM » Author: Mandolin Girl
Oh yes, I've chucked a large chunk, what was left of the year's supply, into the school swimming pool.  :poof:
That was impressive... The water spout hit the ceiling, and some tiles at the bottom of the pool cracked.  :mrg:
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RRK
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Re: What can I do with an LPS arctube? « Reply #7 on: May 10, 2024, 03:03:52 PM » Author: RRK
A guy on youtube recently researched why sodium actually explodes on contact with water. It is sure 150+ years old school demo reaction, but no one knew what is going on in the exact details.  It turned out that there are some wicked physics behind this, and not, it is not hydrogen that explodes. Actually, if sodium reacts with the water  as a chunk, is shall not explode as contact area is rather low. He found that after sodium melts on a slow reaction, it suddenly forms multiple spikes on the sodium-water interface, increasing contact area multiple orders of 10's. And then reaction goes much faster explosion-like. It is not well understood why the spikes are formed, probably because of electric field (!) generated by Na-H2O reaction itself.

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RRK
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Re: What can I do with an LPS arctube? « Reply #8 on: May 10, 2024, 04:02:29 PM » Author: RRK
https://cen.acs.org/articles/93/web/2015/01/Sodium-Potassium-Really-Explode-Water.html

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Andy
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Re: What can I do with an LPS arctube? « Reply #9 on: May 10, 2024, 04:11:44 PM » Author: Andy
I've got a lovely big chunk of Na that's sitting happily in a container of oil but I am planning on demonstrating the reaction to my daughter later this year by dropping a piece of it into the river from a bridge one evening when the river is fast flowing. I don't feel comfortable making NaOH when the river is not fast flowing as I have no intention of harming any wildlife.
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Rommie
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Re: What can I do with an LPS arctube? « Reply #10 on: May 10, 2024, 04:48:41 PM » Author: Rommie
Fortunately there was no wildlife in the swimming pool...  :mrg:
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Rommie
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Re: What can I do with an LPS arctube? « Reply #11 on: May 10, 2024, 06:34:41 PM » Author: Rommie
What, not even any kids..?  :mrg:
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AngryHorse
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Re: What can I do with an LPS arctube? « Reply #12 on: May 10, 2024, 06:47:13 PM » Author: AngryHorse
I remember my school mate Alistair putting some in a plastic Coke bottle containing vinegar, in his dad’s shed one weekend!
He put a pea sized lump in, then screwed the lid on tightly………

……..it blew the window out of the shed!  @-@
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Mandolin Girl
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Re: What can I do with an LPS arctube? « Reply #13 on: May 10, 2024, 06:48:57 PM » Author: Mandolin Girl
What did your mate's dad do to him..?  :poof:
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AngryHorse
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Rich, Coaster junkie!


Re: What can I do with an LPS arctube? « Reply #14 on: May 10, 2024, 06:51:48 PM » Author: AngryHorse
Luckily they were on holiday at the time, and we got another piece!  ;D
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