Talk:Second sound

Typo?
What is this supposed to mean? "The inverse of the normal process phonon lifetime has a value TN-1=4.49×104T4 sec-1." Is there supposed to be an exponent in there? Is T4 a unit of some kind?Enon (talk) 18:52, 10 July 2012 (UTC)
 * Looks like what happens if you copy/paste with superscripts, where the superscriptness doesn't copy. I suspect that the 104 and T4 both have superscript 4. Gah4 (talk) 21:17, 3 November 2020 (UTC)
 * Looks like what happens if you copy/paste with superscripts, where the superscriptness doesn't copy. I suspect that the 104 and T4 both have superscript 4. Gah4 (talk) 21:17, 3 November 2020 (UTC)

first sound
The article seems not to mention the reason for second sound, in that a superfluid can't transmit first (ordinary) sound. Gah4 (talk) 21:18, 3 November 2020 (UTC)

about ten times slower than normal sound waves
The article says: about ten times slower than normal sound waves, but doesn't say in what material, temperature, or pressure those waves are traveling. Since second sound is normally in materials that don't allow for first (usual) sound, this is important. Gah4 (talk) 22:19, 20 July 2021 (UTC)