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Sound has mass?....
Sound has mass?....
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Old 25th March 2019, 12:25 AM   #11
TNT is offline TNT  Sweden
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Honest-2-g*d :-)

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Old 27th March 2019, 05:10 PM   #12
RJM1 is offline RJM1  United States
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Well sound has energy, energy and mass are related by E=MC^2, so mass could be either positive or negative, but very small.

Last edited by RJM1; 27th March 2019 at 05:14 PM. Reason: added first comma
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Old 27th March 2019, 05:24 PM   #13
Galu is offline Galu  Scotland
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Originally Posted by RJM1 View Post
Well sound has energy, energy and mass are related by E=MC^2
This new theory assumes Newtonian mechanics, so the mass transported by the phonons is unrelated to the equivalence of mass and energy as described by relativistic mechanics.
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Old 27th March 2019, 06:18 PM   #14
TNT is offline TNT  Sweden
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Sound is a human perception/notion - it is massless. The mechanisms; air pressure change generator, air, ear, electrons, synapses, that creates a perceived sound, has mass.

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Old 27th March 2019, 06:47 PM   #15
Galu is offline Galu  Scotland
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Sound is a human perception/notion - it is massless.
Sound is not simply a 'notion', but is classed as one of the main forms of energy along with heat, light, electrical etc. Classically, it is considered that energy is transferred via sound waves without transporting mass and, in that respect, you could say sound is 'massless'.

The new theory is a contentious one as the energy transfer is claimed to occur via a particle motion (phonons) which does involve the transport of mass. Still we can rest easy because, at the moment, this is merely a theory and has still to be proved by experiment.
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Old 27th March 2019, 06:47 PM   #16
picowallspeaker is offline picowallspeaker  Italy
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Since air is a gas, each component may react or carry differently the "information" the waves provides. I mean, helium, azote, oxigen
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Old 27th March 2019, 07:34 PM   #17
TNT is offline TNT  Sweden
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Yes, I should raelly have had a "?" in there as this was my own personal trial for a definition

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Old 27th March 2019, 07:39 PM   #18
scottjoplin is offline scottjoplin  Wales
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When the speaker runs out of phonons does it stop working?
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Old 27th March 2019, 07:42 PM   #19
Galu is offline Galu  Scotland
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@ TNT - I think it is fair to say that there is a large "?" mark hanging over the new theory!
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Old 27th March 2019, 07:50 PM   #20
Galu is offline Galu  Scotland
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Originally Posted by scottjoplin View Post
When the speaker runs out of phonons does it stop working?
I think we'll hear soon that a speaker converts electrons directly into phonons thus posing another question - are we in danger of running out of electrons?
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