Coal can be cleaned before it is burned.The flotation method separates coal from its major impurities by taking advantage of the difference in ________ of these materials.

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The flotation method separates coal based on the difference in density between the coal and its impurities. The coal is mixed with water and chemicals, and air is bubbled through the mixture. The coal particles become attached to the bubbles and rise to the surface, where they can be skimmed off, leaving the impurities behind.

Coal Can Be Cleaned Before It Is Burned