Figure shows is the (a, b) ∆ƒshort-z and the (e, f) ∆ƒlong-z curves for the samples with or without heating, respectively. (Figures ) and (f) also contain the curve for 29 h of settling without heating for comparison.) Each ∆ƒshort-z and ∆ƒlong-z curves were transformed into the corresponding conservative force, Fcons, short-z, Fcons, long-z by Sader's transformation. It is known that ∆ƒ depends on the vibrating amplitude, and the relationship between density distribution and force has been well studied, though limited to small molecule liquids . Fcons, short-z and Fcons, long-z curves are shown in Figures ) and 6(g, h), respectively.