Speed limit on a superfluid helium nano-highway: The new research has now shown that even in tiny nanodroplets, helium still exhibits superfluidity...
The result of the experiment was quite astonishing: the measured velocity is always the same. It does not matter whether the impurity is a metal atom, a diatomic molecule or a polyatomic molecule with a cage structure: they all leave the droplet with the same speed. Mass or size thus does not matter. Even the repulsive force (which could be tuned with the laser pulse) turned out not to be of any influence.
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