Keywords: Liquid helium lambda point transition.jpg en When liquid helium is cooled down from 4 2K to the lambda point at 2 2K the liquid for a brief moment boils up violently Suddenly boiling ceases This is the transition from the normal phase to the superfluid phase Own work by uploader Photograph from my movie Liquid Helium Superfluid Alfred Leitner photographed this as part of his movie Liquid Helium Superfluid 1963 The movie had U S copyright 1963 which expired and was not renewed PUBLIC DOMAIN Liquid helium Superfluidity Physics |