What Is Viscosity and How Does It Work?

zero viscosity which means no friction between the molecules of the fluid. The particles inside a gas can bump off each other and exchange energy in real life. In super fluid that doesn't happen so why is kinetic energy getting turned into heat? It's not something you can do with a normal liquid very easily it's a quantum property. When these things get really cold then you have very little uncertainty on their temperature as their wave functions grow big enough to create vortexes.