Alumina, iron, silica, and other noncombustible impurities contained in coal and left after its burning. Ash content is measured as a percent by weight of coal and negatively affects its value. See also fly ash.

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  • After the fire was taken care of, there was a lot of ash left on the floor and it made everyone happy to know the fire was gone.

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  • The plant created so much ash in the air that it triggered asthma attacks in people who lived or worked near by.

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  • You must make sure to clear all ash out of your factory so that your workers are not breathing it in.

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