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>"Experimental data on anomalous absorption and dispersion of sonic, shear, and electromagnetic waves in <i>strongly viscous liquids</i> show that the <i>relaxation theory of wave propagation</i> is <i>not applicable to these liquids</i>."<p>This is quite the statement -- if it is true!<p>Related:<p>General Wikipedia article on relaxation in Physics:<p><a href="https://en.wikipedia.org/wiki/Relaxation_(physics)" rel="nofollow">https://en.wikipedia.org/wiki/Relaxation_(physics)</a><p>Relaxation of Fields and Skin Depth:<p><a href="https://phys.libretexts.org/Bookshelves/Electricity_and_Magnetism/Electromagnetics_and_Applications_(Staelin)/04%3A_Static_and_Quasistatic_Fields/4.03%3A_Relaxation_of_fields%2C_skin_depth" rel="nofollow">https://phys.libretexts.org/Bookshelves/Electricity_and_Magn...</a>