  The specific heat of liquid helium confined under pressure in nanoporous
material and the formation, in these conditions, of a glass phase accompanied
by latent heat are known. These properties are in good agreement with a recent
model predicting, in liquid elements, the formation of ultrastable glass having
universal thermodynamic properties. The third law of thermodynamics involves
that the specific heat decreases at low temperatures and consequently the
effective transition temperature of the glass increases up to the temperature
where the frozen enthalpy becomes equal to the predicted value. The glass
residual entropy is about 23.6% of the melting entropy.
