Abstract
Modified system of high-resolution Bragg reflection was used to observe both the spatial and temporal sound waves simultaneously in the relaxation region of liquid furan (${\mathrm{C}}_{4}$${\mathrm{H}}_{4}$O). The spatial phase velocity at 100 MHz was shown to be higher than the temporal velocity by 7 m/s at 20\ifmmode^\circ\else\textdegree\fi{}C. The result is in good agreement with the theoretical prediction, providing an experimental evidence of the difference between them.
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