Ultra Cold Liquid Helium-3 by NASA
If you’re squeamish, you may not want to listen to the strange whistle of ultra-cold liquid helium-3 that changes volume relative to the North Pole and Earth’s rotation. When ultra-cold liquid helium-4 was squashed through an array of tiny apertures, a phenomenon occurred in which the helium-4 repeatedly sped up, slowed down and vibrated. This produced a “quantum whistle” — a whistling sound that went from high to low.
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