Can Heavier Liquid Float on Top of a Lighter One？  

作　　者：A. H. Ayyad F. Takrori 

机构地区：[1]Department of Chemistry, Faculty of Science and Technology, Hebron University, P.O. Box 40, Hebron, West Bank, Palestine

出　　处：《Chinese Physics Letters》2011年第1期127-129,共3页中国物理快报（英文版）

摘　　要：We report on a first observation of a floating- spherical Hg （density 13g/cm3） drop on top of a glycerin （density 1.26g/cm3） drop, the latter is hemispherical and about four times larger in volume. This observation is clearly against nature＇s gravity law and has never been reported before. Here we present spectacular high resolution photos that clearly demonstrate this remarkable floating phenomenon. Using milli-Q water, the Hg drop would stay down adhered at the triple line. Instead, the coincidental use of tap water displays the same phenomenon. Increasing the volume of the supporting liquid to a certain value causes the Hg drop to sink. A 5-M NaCl aqueous solution is found enough to show the same floating phenomenon. This floating mercury as a phenomenon is puzzling. On this length scale it seems that surface tension and curvature dominate over gravity.We report on a first observation of a floating- spherical Hg （density 13g/cm3） drop on top of a glycerin （density 1.26g/cm3） drop, the latter is hemispherical and about four times larger in volume. This observation is clearly against nature＇s gravity law and has never been reported before. Here we present spectacular high resolution photos that clearly demonstrate this remarkable floating phenomenon. Using milli-Q water, the Hg drop would stay down adhered at the triple line. Instead, the coincidental use of tap water displays the same phenomenon. Increasing the volume of the supporting liquid to a certain value causes the Hg drop to sink. A 5-M NaCl aqueous solution is found enough to show the same floating phenomenon. This floating mercury as a phenomenon is puzzling. On this length scale it seems that surface tension and curvature dominate over gravity.

关 键 词：Soft matter liquids and polymers Fluid dynamics Surfaces interfaces and thin films 

分 类 号：TG141[一般工业技术—材料科学与工程] TQ444[金属学及工艺—金属材料]