# Does sound waves have mass?

In that case, one would say that a material object traveling at the speed of light would have infinite mass. I refer you to another answer I've written for more information on the historical context of the terms. But, do light waves have any sort of measurable mass? Or in that same vein, do sound waves? read more

The particles of light waves - the photons - have the rest mass $m_0$ equal to zero. However, at the speed of light, $v=c$, the total mass $$m= \frac{m_0}{\sqrt{1-v^2/c^2}}$$ is increased to an indeterminate form, $0/0$, which should be evaluated as a finite number. read more

Sound waves to not have mass. Sound waves are propagation of pressure differences from the source. It is due to the Rapid vibration of something in the source for example a Speaker that the individual molecules in the material start to have slight displacement from the mean position along the direction of propagation. read more

Source: quora.com

Sound is energy moving through a medium. Energy has mass (E = mc2), therefore sound has mass (but it does not have a rest mass). If you have a box with sound in it, it would weigh more than the same box with no sound in it. read more

Source: quora.com

Do light and sound waves have mass. The particles of light waves - the photons - have the rest mass $m_0$ equal to zero. However, at the speed of light, $v=c$, the total mass $$m= \frac{m_0}{\sqrt{1-v^2/c^2}}$$ is increased to an indeterminate form, $0/0$, which should be evaluated as a finite number. read more

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Does sound have mass?
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