Liquid Helium is called superfuluid. Why ?

Liquid helium is called super fluid. Why?

Liquid helium is called super fluid. Why?

Helium is filled in gas thermometers. Why?

Statement I : He - II has high viscosity and flows downward. Statement II : Liquid helium is used as cryogenic liquid.

Why Helium is totally inert ?

What type of solid is called a supercooled liquid with high viscosity and why?

Why are the gases and liquids called fluids?