Pressure builds in the tube until the helium squirts out of the capillary in the top of the tube, creating a "helium fountain". Since the second law of thermodynamics states that heat cannot flow from...Pressure builds in the tube until the helium squirts out of the capillary in the top of the tube, creating a "helium fountain". Since the second law of thermodynamics states that heat cannot flow from lower to higher temperatures, this implies that the superfluid component carries no heat: any heat in the helium II must be in the normal component.
