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Physicists confirm the fascinating existence of "second sound"
MIT researchers observe a “second wave” of heat in superfluid helium, confirming that heat propagates like sound.
MIT researchers, after exploring a superfluid quantum gas, have shown that heat can travel in a wavelike manner called second sound, instead of spreading out and calming down. It’s not something you’d experience in everyday life, but in ultra-cold or highly ordered systems – like certain crystals or quantum fluids – second sound reveals a completely different side of how energy can move. These tiny tracers helped capture the motion of the fluid itself, and showed how heat pulses affected surrounding particles – without disturbing the second sound signal.
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