Second Sound
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Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Second sound is a quantum mechanical phenomenon in which heat transfer occurs by wave-like motion, rather than by the more usual mechanism of diffusion. Heat takes the place of pressure in normal sound waves. This leads to a very high thermal conductivity. It is known as "second sound" because the wave motion of heat is similar to the propagation of sound in air. At temperatures below the lambda point 2.1768 K, He enters a superfluid state and has almost perfect heat…mehr

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Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Second sound is a quantum mechanical phenomenon in which heat transfer occurs by wave-like motion, rather than by the more usual mechanism of diffusion. Heat takes the place of pressure in normal sound waves. This leads to a very high thermal conductivity. It is known as "second sound" because the wave motion of heat is similar to the propagation of sound in air. At temperatures below the lambda point 2.1768 K, He enters a superfluid state and has almost perfect heat conduction. The helium is in a macroscopic quantum state. At temperatures falling toward 0 K the speed of temperature and entropy waves increases. These can be generated and observed in a resonator. At a temperature of 1.8 K the temperature wave propagates at approximately 20 m/s.