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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  • Ash — Ash, n., sing. of {Ashes}. [1913 Webster] Note: Ash is rarely used in the singular except in connection with chemical or geological products; as, soda ash, coal which yields a red ash, etc., or as a qualifying or combining word; as, ash bin, ash… …   The Collaborative International Dictionary of English

  • Ash — ([a^]sh), n. [OE. asch, esh, AS. [ae]sc; akin to OHG. asc, Sw. & Dan. ask, Icel. askr, D. esch, G. esche.] 1. (Bot.) A genus of trees of the Olive family, having opposite pinnate leaves, many of the species furnishing valuable timber, as the… …   The Collaborative International Dictionary of English

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