Sciencemadness Discussion Board - I want to hear your favorite chemistry demonstrations

I want to hear your favorite chemistry demonstrations

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Morgan - 1-1-2024 at 12:45

The Trevelyan Rocker reminds of a curious effect with steel ball bearings. If an electric current is passed between the inner race and the outer race via the balls the races will rotate wrt each other after an initial push to get them going.

See: https://www.acorn-ind.co.uk/insight/just-for-fun-the-ball-be...

Yes, that thought came to mind when I first started toying with Trevelyan Rockers. Also this effect as if such a surface might propel a hot bearing ball, in order for it to rock/teeter along in one direction.
https://www.gyroscope.com/d.asp?product=LEIDENFROSTRING
https://www.youtube.com/watch?v=mVhwiQO16VI

[Edited on 2-1-2024 by Morgan]

Morgan - 21-1-2024 at 17:43

From the 1800's, this lecture with illustrations brings to mind the bearing ball motor whatever the case is with that motor.

"Mr. Gore has also obtained the rotation of light balls, by placing them on circular rails of hot copper, the rolling force in this case being the same as the rocking force in the Trevelyan instrument."

A video following his idea.
Tyndall's Heat Considered as a Mode of Motion
https://www.youtube.com/watch?v=2u6yTjKzGpM

As an aside ...
Slow Acceleration of the Trevelyan Rocker Effect
https://www.youtube.com/watch?v=C31kqFgWjjk

6061 Bar Stock Thermal Resonant Feedback
https://www.youtube.com/watch?v=UryWnalrtO0

[Edited on 22-1-2024 by Morgan]

Morgan - 26-1-2024 at 11:29

More on the exploration of the ball bearing motor subject matter trying to see if heat alone could compete with the electromagnetism theory - whether one or the other or both.
Little Wheel Motor or Trevelyan Rocker Roulette
https://www.youtube.com/watch?v=9jKUXVG8duE

[Edited on 26-1-2024 by Morgan]

Morgan - 9-2-2024 at 14:56

The ongoing saga this time with a revolving brass sphere.
A Single Brass Ball Bearing Motor
https://www.youtube.com/watch?v=Se1hlK7twzc

Morgan - 22-2-2024 at 12:30

Quote: Originally posted by Morgan

Thought is copper-magnesium alloy was mildly interesting.

Tim's Amazing Yi Bell
https://www.youtube.com/watch?v=id-u9ro50TM

"The Yi bell is used to demonstrate the relationship between temperature and oscillation damping."
https://www.a3bs.com/product-manual/U30002_EN.pdf

Copper-magnesium eutectic as phase change material for thermal storage applications: Thermophysical properties and compatibility
https://www.sciencedirect.com/science/article/abs/pii/S23521...

[Edited on 18-12-2023 by Morgan]

Perhaps this would add to the above demonstrations if a Tibetan cymbal were heated too.

Tibetan Tingsha Cymbals Versus Temperature
https://www.youtube.com/watch?v=4SOyVX4r3MA

Morgan - 23-2-2024 at 05:56

Another alloy with the hot versus cold metal ringing effect, here discovered searching for a material for a nose cone reentry material.
The Metal That Remembers - Nitinol
https://www.youtube.com/watch?v=0xT2du855mQ&t=79s

Would any rocket scientists know the reason/clarify why ringing would be a desired property of a metal for the nose cone example? Could it be something indicating the metals mixed well?

[Edited on 23-2-2024 by Morgan]

averageaussie - 29-2-2024 at 15:40

Quote: Originally posted by Morgan

Another alloy with the hot versus cold metal ringing effect, here discovered searching for a material for a nose cone reentry material.
The Metal That Remembers - Nitinol
https://www.youtube.com/watch?v=0xT2du855mQ&t=79s

Would any rocket scientists know the reason/clarify why ringing would be a desired property of a metal for the nose cone example? Could it be something indicating the metals mixed well?

[Edited on 23-2-2024 by Morgan]

The ability for nitinol to remember its shape has something to do with crystal structure, and the deformation of it. metal ringing, called a metal cry or twining, also has something to do with crystal structure and the deformation of it.

Morgan - 1-3-2024 at 08:39

Quote: Originally posted by Morgan

Morgan - 1-3-2024 at 08:39

Quote: Originally posted by Morgan

Perhaps homogeneous mixing was one aspect

"Hoping to hear a clear bell-like ring, indicating that the metal had the properties he was hoping for. Instead, it returned a dull thud–similar to dropping a sack of flour on the ground. Worried that the ingot was filled with internal flaws, he dropped one of the ingots that hadn’t cooled yet. This returned a wonderful bell-like ring. However, after the ingot had been cooled in water, it returned a dull, leaden thud, just like the first one. This is the first indication that nitinol had a substantially different double state. Buehler named his alloy nitinol for Nickel-Titanium Naval Ordinance Laboratories"

Gleaned from a viewer comment on this video
https://www.youtube.com/watch?v=8-dCIkJAjyM

Tangent on ringing rocks, maybe of interest ...
"The iron content of the diabase is often identified as the source of the ringing ability. Actual chemical analysis of the Coffman Hill diabase[13] shows that iron content (as ferric oxide) of the rock ranges from 9% and 12%. Although comparatively high for an average igneous rock (3% is typical for granite), it is within the normal range for a basalt. This point suggests that the iron content is not a primary factor in the ringing ability."
https://en.wikipedia.org/wiki/Ringing_rocks

Ringing Rocks Park Bucks County PA
https://www.youtube.com/watch?v=fBiVt1pKnAQ

[Edited on 1-3-2024 by Morgan]

Morgan - 4-3-2024 at 04:36

Perhaps not all that enthralling, but this simple demonstration was an interesting phase change effect.

"Can you hear that?"
How NASA Reinvented The Wheel
https://www.youtube.com/watch?v=vSNtifE0Z2Q&t=900s

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