Ash

Ash
  The non-combustible residue of a combusted substance composed primarily of alkali and metal oxides.
  ***
  Impurities consisting of silica, iron, alumina, and other noncombustible matter that are contained in coal. Ash increases the weight of coal, adds to the cost of handling, and can affect its burning characteristics Ash content is measured as a percent by weight of coal on an "as received" or a "dry" (moisture-free, usually part of a laboratory analysis) basis.
  U.S. Dept. of Energy, Energy Information Administration's Energy Glossary
  ***
  Non-organic, non-flammable substance left over after combustible material has been completely burned.
  California Energy Comission. Dictionary of Energy Terms

Energy terms . 2014.

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