Abstract
From the low frequency measurements of the dielectric constant of ultra low impurity liquid argon, we obtain the density of the liquid in the vicinity of the critical point. Along the 50 atm isobar slightly above the critical temperature, we find apparent discontinuity in the density, suggesting proximity to a prewetting transition. A simple mean field theoretical analysis provides a qualitative description of some aspects of this behavior Nous avons obtenu la densite de l'argon au voisinage du point critique a partir de mesures de la constante dielectrique a basse frequence. Nous avons observe une discontinuite de la densite le long de l'isobare correspondante a 50 atm a une temperature un peu au-dessus de la temperature critique. Cette discontinuite suggere une transition de pre-mouillage. Un calcul simple, selon le modele du champ moyen, reussit a rendre compte de quelques aspects des resultats de mesures
Published Version
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