They are said to be insoluble . Oils are usually insoluble in water. When a mixture of oil and water is shaken, the result is an emulsion . If an insoluble solid is mixed with water, the result is called a suspension . Pure water does not conduct electricity.
Many solutions do conduct electricity.
This is because the salt breaks up into ions . These ions can move and this causes the solution to conduct electricity. Passing an electric current through a conducting liquid or solution causes the ions to move. This breaks up compounds into their constituent elements, a process called electrolysis . Atoms in a gas are free to move independently from each other.