A UNIQUE DENSITY, NON-MISCIBILITY DEMONSTRATION
standing each liquid and object will eventually find its correct position, since no two of the liquids used are
RALPH E. DUNBAR Dakota Weslqvan University, Mitchell, SouthPakota
THE differences in density of four common liquids, mercury, dichloroethyl ether, water, and oil, the nonmiscibility of any combination of these four liquids, and their buoyancy as expressed by Archimedes' principle can be rather conveniently demonstrated by use of the simple apparatus illustrated herewith. A tall hydrometer jar or wide-mouthed bottle makes a suitable container. A cork, piece of oak wood, ebony, brass weight or coin, and piece of gold or platinum will find their positions on the surfaces of the several liquids as illustrated. If a tightly closed container is used the entire contents may be thoroughly mixed, and upon
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miscible one in the other. When once this piece of equipment has been prepared, it may be retained indefinitely for demonstration purposes.
