Residue after a volcanic eruption

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Ash.

Last seen on: Daily Celebrity Crossword – 3/5/20 Top 40 Thursday


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Random information on the term ” Ash”:

Wood ash is the residue powder left after the combustion of wood, such as burning wood in a home fireplace or an industrial power plant. It is used traditionally by gardeners as a good source of potash.

Many studies have been conducted regarding the chemical composition of wood ash, with widely varying results. Some quote calcium carbonate (CaCO3) as the major constituent, others find no carbonate at all, but calcium oxide (CaO) instead. Some show as much as twelve percent iron oxide while others show none, though iron oxide is often introduced through contamination with soil. A comprehensive set of analyses of wood ash composition from many tree species has been carried out by Emil Wolff, among others.

Several factors have a major impact on the composition:

Typically between 0.43 and 1.82 percent of the mass of burned wood (dry basis) results in ash. Also the conditions of the combustion affect the composition and amount of the residue ash, thus higher temperature will reduce ash yield.

Ash on Wikipedia