Ash or ashes are the solid remains of fires. Specifically, it refers to all non-aqueous, non-gaseous residues that remain after something is burned. In analytical chemistry, in order to analyse the mineral and metal content of chemical samples, ash is the non-gaseous, non- liquid residue after a complete combustion.
Ashes as the end product of incomplete combustion will be mostly mineral, but usually still contain an amount of combustible organic or other oxidizable residues. The best -known type of ash is wood ash, as a product of wood combustion in campfires, fireplaces, etc. The darker the wood ashes, the higher the content of remaining charcoal will be due to incomplete combustion.
Like soap, ash is also a disinfecting agent (alkaline). The World Health Organization recommends ash or sand as alternative when soap is not available.
Specific types
Wood ash
Products of coal combustion
Bottom ash
Fly ash, product of coal combustion
Breeze, ash recovered from burning urban rubbish
Cigar ash, the ash produced when a cigar is smoked
Incinerator bottom ash, a form of ash produced in incinerators
Vibhuti, ash used in Hindu rituals
Ashes and dried bone fragments, or "cremains", left from cremation
Volcanic ash, ash that consists of glass, rock, and other minerals that appears during an eruption
See also
Cinereous, consisting of ashes, ash-coloured or ash- like
Potash, a term encompassing many useful potassium salts which were traditionally derived from plant ashes, but today are typically mined from underground deposits.
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