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A comment on Scientists Watch as Heat Moves at the Speed of Sound.

Re:Scientists Watch as Heat Moves at the Speed of Sound by pps43 on Sunday March 24, 2019 @10:59AM (#19476691)
So the effect was known for a long time, and the new development is that it was now observed at higher temperatures. But 120 K is still pretty cold, so it doesn't really matter much for practical applications.
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Re:Scientists Watch as Heat Moves at the Speed of Sound by freethemullet on Sunday March 24, 2019 @02:22PM (#19477867)
Depending on the concentration of defects and the length scale of the system, theory suggests that it may be possible to observe second sound at much higher temperatures beyond 120 K.
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