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Sound has mass?....
Sound has mass?....
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Old 22nd March 2019, 03:45 AM   #1
PRR is offline PRR  United States
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Default Sound has mass?....

...and it is negative?

Some sounds might possess a tiny but measurable amount of negative gravitational mass, Scientific American

Phys. Rev. B 97, 134516 (2018) - Mutual interactions of phonons, rotons, and gravity (paywall)
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Old 22nd March 2019, 01:23 PM   #2
Bicicletta is offline Bicicletta  Europe
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They seem to have built a theoretical model to model sound as particles. No wonder math works.
The sound changes the energy content of a considered volume: no wonder that this has gravitational effects.
Negative mass? This leads to quantum physics and vacuum energy: I can't follow.
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Old 22nd March 2019, 01:51 PM   #3
ddogtheroadkill is offline ddogtheroadkill  Finland
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Good music always lightens my mood, so at least in nonscientifical way this theory is accurate.
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Old 22nd March 2019, 02:08 PM   #4
dhaen is offline dhaen  Europe
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I've always preferred "heavy music"
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Old 22nd March 2019, 02:12 PM   #5
KaffiMann is offline KaffiMann  Norway
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Sound has mass?....
Quote:
Originally Posted by Bicicletta View Post
Negative mass? This leads to quantum physics and vacuum energy: I can't follow.
It is not negative mass, it is negative gravity.
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Old 22nd March 2019, 02:23 PM   #6
avtech23 is offline avtech23  Australia
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Sound has mass?....
Quote:
“Because their gravitational mass is negative, phonons fall upwards.”
Not sure what the difference between conventional mass and gravitational mass is...guess I need to brush up on my quantum physics..
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Old 22nd March 2019, 02:39 PM   #7
KaffiMann is offline KaffiMann  Norway
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Sound has mass?....
I think it's not too far off this: A gas with negative gravity still has mass, only it floats away from the gravitational centre in our specific gravity. Orsomethinglikethat.

Edit:
But probably behaves more like a magnetic particle than a gas, only replace "magnetic" with "gravity" sort of.

Last edited by KaffiMann; 22nd March 2019 at 02:45 PM.
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Old 23rd March 2019, 05:36 PM   #8
Galu is offline Galu  Scotland
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Quote:
Quote from the Scientific American article >
"Sound waves having mass are unlikely to have a major impact on day-to-day life"
I'm reassured that, even though they have negative gravitational mass, I won't have to scrape phonons off the ceiling of my listening room!
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Old 24th March 2019, 03:28 PM   #9
KaffiMann is offline KaffiMann  Norway
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Sound has mass?....
... If you hit a surface with enough Phonons, will it eventually work like an insanely fine sand blast process?
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Old 24th March 2019, 06:29 PM   #10
Galu is offline Galu  Scotland
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For interested parties, here's some more on the physics of 'sonic sandblasting'!

Quote:
The traditional view of sound is that it is a wave motion which transfers energy without transporting mass.

The new theory suggests that sound is a particle motion. The particles of sound are called phonons and they interact with a gravitational field in a way that requires them to transport mass as they move.

For a 1-second-long, 1-watt sound wave in water, the amount of mass would be about 0.1 milligrams. “It’s honest-to-God gravitational mass, the type we experience every day.”
This and more information can be found in the following link:
Physics - Focus: Sound Waves Carry Mass
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