The Thickness of the Helium Film

Abstract

It is suggested that the change in thickness of the helium film at the $\lambda$ point is not caused by any essential change in the thermodynamic relation between film thickness, pressure, and temperature. It can be a result of the onset of superfluidity below the $\lambda$ point which causes a great change in the rate of approach to equilibrium and consequently of the average of the film thickness during the experimental fluctuation of pressure and temperature.