Ayecarumba
Ayecarumba
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February 4th, 2020 at 12:58:06 PM permalink
I purchased a wide mouth container, roughly the shape of a 5"cube filled with 36 oz. of trail mix composed of roughly equal volumes of:

Peanuts
M&M's
Raisins
Chocolate chips
Peanut butter chips

As I periodically "stir" the contents by pouring a handful out at a time, I notice that, as expected, the slick shelled M&M's tend toward the bottom of the container. However, I am surprised to find lots of peanut skins remaining amongst the M&M's and broken peanut pieces as the container gradually empties. The peanut skins are feather light. Why didn't they work their way to the top of the container as the heavier contents settled?
Simplicity is the ultimate sophistication - Leonardo da Vinci
unJon
unJon
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Ayecarumba
February 4th, 2020 at 2:05:36 PM permalink
Quote: Ayecarumba

I purchased a wide mouth container, roughly the shape of a 5"cube filled with 36 oz. of trail mix composed of roughly equal volumes of:

Peanuts
M&M's
Raisins
Chocolate chips
Peanut butter chips

As I periodically "stir" the contents by pouring a handful out at a time, I notice that, as expected, the slick shelled M&M's tend toward the bottom of the container. However, I am surprised to find lots of peanut skins remaining amongst the M&M's and broken peanut pieces as the container gradually empties. The peanut skins are feather light. Why didn't they work their way to the top of the container as the heavier contents settled?



I saw a cool article on a related topic. Will try to find link. In short, itís not predominantly about weight, itís about shape. Smaller things tend towards the bottom as they can ďfallĒ through the cracks of bigger things. Doesnít really explain the M&Ms as I assume they are on the bigger side of what makes up the mix. But maybe it is slick shells as you say.

Edit: here is article: https://medium.com/the-physics-arxiv-blog/brazil-nut-effect-explains-mystery-of-the-boulder-strewn-surface-of-asteroids-e5fae1b6c242
The race is not always to the swift, nor the battle to the strong; but that is the way to bet.
TigerWu
TigerWu
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Ayecarumba
February 4th, 2020 at 3:22:06 PM permalink
It's the size that counts. (heh heh)

That's why the tiny crumbs and featherweight chip dust is always at the bottom of the bag.
FleaStiff
FleaStiff
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Ayecarumba
February 4th, 2020 at 3:51:27 PM permalink
You are touching upon one of the greatest inventions in history: the corning of gunpowder. Particles of different size and shape resulted from keeping gunpowder dry. Once it was weted it could be worked to uniform size and would remain so during shipping.
Ayecarumba
Ayecarumba
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February 4th, 2020 at 6:10:27 PM permalink
Quote: unJon

I saw a cool article on a related topic. Will try to find link. In short, itís not predominantly about weight, itís about shape. Smaller things tend towards the bottom as they can ďfallĒ through the cracks of bigger things. Doesnít really explain the M&Ms as I assume they are on the bigger side of what makes up the mix. But maybe it is slick shells as you say.

Edit: here is article: https://medium.com/the-physics-arxiv-blog/brazil-nut-effect-explains-mystery-of-the-boulder-strewn-surface-of-asteroids-e5fae1b6c242



Wow! The example is almost exactly what I experienced. Thanks unJon.
Simplicity is the ultimate sophistication - Leonardo da Vinci
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