An Etymological Dictionary of Astronomy and Astrophysics
English-French-Persian

The ability of a substance to flow; reciprocal of → viscosity.

→ fluid + → -ity.

The phenomenon occurring in → liquid helium (→ helium I) cooled below the → lambda point temperature of 2.17 K, whereby it flows freely with no measurable → friction and → viscosity.

→ super-; → fluidity.