Oil is an organic liquid, insoluble in water, when it is separated from the water layer. It is soluble in water as fuel. Or in some organic solvent. Because water is a polar substances. But oil is a non-polar substances such as alcohol, oil, etc., has a lower density than water. The second type of liquid that can be mixed together in a homogeneous liquid that the two species have the same features. But oil and water do not mix because. "Attraction between molecules of fuel and the distance over water. This is the reason why oil and water, so compatibility is not a substance that is a major component of carbon, hydrogen, oxygen and
salt water is denser than oil, and salt and mix well sunk under water. When salt water and some oil through the oil has sunk to stick with salt and salt dissolve the oil will rise.
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