Slow-mo of a ball-bearing dropped into (fluidized) sand

published by arvana

2 months 1 week ago • 4398 views

tags: slow motion, ball, bearing, iron, steel, sand

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Comments

This sand looks extremely liquid. I suspect that it's sand in suspension of some liquid. Look at the ripples at the end.

written by Pooterius | 2 months 1 week ago | CH

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belive it or not, sand acts a lot like a liquid quite often, it can flow, ripple, wave and all sorts of things what a liquid can do.

written by Wolfie | 2 months 1 week ago | CH

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There's also a big difference between 'sharp' sand (crushed rock) and round sand (like from a beach). Round sand can be much more fluid — it acts like little ball-bearings if it's dry. But sharp sand is much better for making concrete.

written by arvana

| 2 months 1 week ago | CH

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this hasn't been sifted before? inconceivable!

written by winkler1

| 2 months 1 week ago | CH

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I've actually seen this video before on a site that demonstrates the properties of quick sand and sand traps (sand being suspended above a pocket of air, or infused with air) In this particular vid they are forcing air up throught the sand...

From the university of Twente in the NEderlands (woohoo) http://stilton.tnw.utwente.nl/dryquicksand/video.htm

written by Peroxide

| 2 months 1 week ago | CH

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^ AKA please change the title to Dry Quicksand

written by Peroxide

| 2 months 1 week ago | CH

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Yes as Peroxide said this is not regular sand. It's an experiment demonstrating a possible mechanism for the behavior of dry quicksand, which I believe, has not been observed or recorded conclusively outside a laboratory setting. There are many stories of people and things dissapearing into dry quicksand but no one has been able to find a naturally occuring quicksand to reproduce these claims. This experiment lends credibility to these stories, suggesting fine wind blown sands, could potentially settle and accumulate to create a volume of sand with similar characteristics to those demonstrated in the experiment.

written by Ghostly | 2 months 1 week ago | CH

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Fluidized sand is just normal sand with compressed) air being pumped in. It acts like a liquid until the air is shut off, then it acts like normal sand again.

written by quantumushroom

| 2 months 1 week ago | CH

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Like a fluid, but insanely high damping and non-existent surface tension.

written by jwray

| 2 months 1 week ago | CH

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>> ^quantumushroom:
Fluidized sand is just normal sand with compressed) air being pumped in. It acts like a liquid until the air is shut off, then it acts like normal sand again.

But in this experiment they shut off the air before dropping the ball. The sand was just very loosely stacked. Have a read of the article published in Nature in Dec 2004, it's only one page so I've put it up: here

written by Ghostly | 2 months 1 week ago | CH

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Thanks for the explanation, Ghost. I'd not heard of this "dry quicksand" before. Sounds like a fun experiment.

written by Pooterius | 2 months 1 week ago | CH

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Cannonball!!!

written by Mavmike | 2 months 1 week ago | CH

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