Markus Reiner in 1945 wrote: 'Accordingly, the term "Euclid solid" was used for the (nonexisting) "rigid" body and "Pascalian liquid" for the (equally nonexisting) "ideal" liquid.' Source: https://www.rheology.org/sor/Publications/RheoBulletin/RB1942Jun.pdf page 53.
Let's consider liquid helium, an example of the Bose-Einstein condensate fluid, which experimentally presents the phenomenon of Superfluidity, at very low temperatures (T < 2 K). It meets at least one of the requirements of the Pascalian liquid: zero viscosity. The other requirement, however, is that infinite bulk modulus (or k ---> infinite), which is not satisfied. Is liquid helium the closest thing to Pascalian liquid? In some conditions of the physical world, whether on Earth or in some conditions (even if only in a laboratory or in extraordinary conditions (star cores, perhaps...?), is there such a "Pascalian liquid"?
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