{"id":1202,"date":"2021-05-02T06:58:29","date_gmt":"2021-05-02T06:58:29","guid":{"rendered":"\/?p=1202"},"modified":"2021-05-02T06:58:29","modified_gmt":"2021-05-02T06:58:29","slug":"please-correct-an-error-on-sciencing-com-physics-of-plasma-globes","status":"publish","type":"post","link":"\/?p=1202","title":{"rendered":"Please correct an error on Sciencing.com, Physics of Plasma Globes"},"content":{"rendered":"
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I happened on a nicely done study of the plasma ball.\u00a0 The filaments are re-created every cycle.\u00a0 They start as spherically symmetric (probably depending on the roughness of the sphere they use) and then extend outward at fast but finite speed. Each cycle, the tendrils (that is the most common name so far) follow the previous paths.\u00a0 The gas is near atmospheric pressure.<\/div>\n
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The number of filaments depends on the frequency.\u00a0 And the peak is about 20 KiloHertz (depends on the ball and its voltage and composition of the gases).<\/div>\n
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Study of the Formation and Motion of Plasma Globe Filaments with High Frequency Photography by Mike Campanell<\/div>\n
http:\/\/doeplasma.eecs.umich.edu\/files\/Web_Campanell_Michael_2013_04_12.pdf<\/a><\/div>\n
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Measurements of the Motion of Filaments in a Plasma Ball by Campanell, Laird, Provost, Vasquez, Zweben<\/div>\n
https:\/\/w3.pppl.gov\/~szweben\/Papers\/coauthorpapers\/CampanellPoP10.pdf<\/a><\/div>\n
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With the relatively low cost of the tools used in these studies, except for the camera. This is a pretty good introduction to many aspects of “gaseous conductors” and “electrical conduction in gases”.<\/div>\n
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On filament structure and propagation within a commercial plasma globe by Burin ,Simmons, Deja, Zeben, Nagy, Brunkhorst<\/div>\n
https:\/\/aip.scitation.org\/doi\/am-pdf\/10.1063\/1.4919939<\/a><\/div>\n
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Some interesting background Final Report: Structure and Behavior of RF-Driven Plasma Filaments in High-Pressure Gases<\/div>\n
https:\/\/www.osti.gov\/servlets\/purl\/1163948\/<\/a><\/div>\n
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Cold plasma poration and corrugation of pumpkin seed coats by Alexander G. Volkov, Jewel S. Hairston, Darayas Patel, Ryan P. Gott, Kunning G. Xu<\/div>\n
https:\/\/par.nsf.gov\/servlets\/purl\/10091616<\/a><\/div>\n
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Filamentary plasma discharge inside water – initiation and propagation of a plasma in a dense medium by Paul Ceccato<\/div>\n
https:\/\/pastel.archives-ouvertes.fr\/pastel-00005680\/document<\/a><\/div>\n
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In high voltage power transmission cable insulation, there are tendrils or dendrites called “water trees” or “electric treeing” that form.\u00a0 They look like the negative discharges from Paul Ceccato’s thesis<\/div>\n
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\"\"I doubt you read this far. but doing this kind of tracing on about 20,000 topics on the Internet over the last 23 years has taught me that persistence and method can trace out very complex seeming things and let you work with them fairly easily with low cost tools.\u00a0 And it has shown me how connected and repeated almost every interesting phenomena.<\/div>\n
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Full-Wave Simulation of High-Frequency Electromagnetic Propagation Through Inhomogeneous Plasma by Thomas Williams<\/div>\n
https:\/\/core.ac.uk\/download\/pdf\/30268047.pdf<\/a><\/div>\n
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Laser Filamentation Interaction With Materials For Spectroscopic Applications by Matthew R Weidman<\/div>\n
http:\/\/etd.fcla.edu\/CF\/CFE0004616\/Dissertation_Weidman.pdf<\/a><\/div>\n
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Electrical treeing<\/div>\n
https:\/\/en.wikipedia.org\/wiki\/Electrical_treeing<\/a><\/div>\n
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Water treeing in Middle Voltage cables<\/div>\n
http:\/\/www.cablab.com.au\/technical\/water-treeing-in-middle-voltage-cables\/<\/a><\/div>\n
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\"\"<\/div>\n
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Hello,<\/div>\n
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Today, I was putting together a model of “plasma balls”, those toys.\u00a0 Recently I was going over “ball lightning”.<\/div>\n
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How Does a Plasma Ball Work? by Jonathan Marker<\/div>\n
https:\/\/sciencing.com\/space-science-kits-that-are-out-of-this-world-13763827.html<\/a><\/div>\n
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Change <\/strong><\/div>\n
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“A plasma ball is essentially a miniature Tesla coil channeling an alternating voltage of about 2-5 kilovolts at a frequency of about 30 Hertz, enclosed within a glass ball containing an inert gas such as neon or argon.”<\/div>\n
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to<\/div>\n
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“A plasma ball is essentially a miniature Tesla coil channeling an alternating voltage of about 2-5 KiloVolts at a frequency of about 30 KiloHertz, enclosed within a glass ball containing an inert gas such as neon or argon.”<\/div>\n
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Comment: Since the electric field and electron current are primarily one way, I wonder if it is alternating in the sense you suppose.<\/div>\n
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Recommendations:<\/strong><\/div>\n
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I suggest you move the “dropdowns-wrapper” that contains “Jonathan Marker, References, Photo Credits” just under the title. Show the author and keep that other material there to show when people hover.<\/div>\n
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I recommend hoverboxes that pop up when you hover those three details.\u00a0 A quality hoverbox can be moved, resized, minimized, maximized, restored, saved or dragged to containers.<\/div>\n
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Under Sciencing logo should be About Us, Contact Us, Team, Patrons or Sponsors.\u00a0 Remove or minimize static headers and footers. Try to minimize total scroll square pixels.\u00a0 Use one screen whereever possible and bring the material to the viewer, don’t keep using “click and go to a whole new page”.<\/div>\n
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Each article and author can have “donate” “support” “encourage” buttons.\u00a0 At the very least “like”.\u00a0 But dollars can indicate level of value, help pay your expenses, and encourage authors, designers and members of your group to better themselves and serve better.<\/div>\n
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Spend a few days and just read the 18,300 entry points that come up on Google from Site:sciencing.com<\/div>\n
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Errors:<\/strong><\/div>\n
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When I was inspecting the page, I saw 105 errors<\/span> and warnings.\u00a0 You have good material, but poor Internet.<\/div>\n
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Your pages are really too busy for people to see easily.\u00a0 If you want to teach then make it ad-free and age and experience specific.<\/div>\n
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Your pages are using a hybrid of cell phone and desktop layouts. Detect the visitors device and scale or serve appropriately.<\/div>\n
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You have good people and materials, but if you think of your website as a portrait and guide to your group – it is not done well.<\/div>\n
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Richard Collins, Director, The Internet Foundation<\/div>\n","protected":false},"excerpt":{"rendered":"

I happened on a nicely done study of the plasma ball.\u00a0 The filaments are re-created every cycle.\u00a0 They start as spherically symmetric (probably depending on the roughness of the sphere they use) and then extend outward at fast but finite speed. Each cycle, the tendrils (that is the most common name so far) follow the
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