Pour any oil in water. Mix thuroughly until you see a uniform, murky color. Leave to sit out. Whneyou come back the water and the oil will have separated into layers.
As you may have read, water is polar. It has a charge and is attracted to objects of opposite charge. In water’s case, this can be itself. Oil, however, is non-polar. It has no charge and the hydrogens on the oils cannot form hydrogen bonds. Water is attracted to itself and not to oil. They repell each other and separate based on density within the container.
The polarity of water has lead to it’s name as the “universal solvent.” Although, water cannot dissolve everything (like your hand, for example) it can dissolve the most substances than any other solvent known to man. Since water is polar and possesses both a negative and positive charge it can dissasociate many polar substance, no matter the charge.
Properties of Water 
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