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Ash is an impurity consisting of [[silica]], [[iron]], [[alumina]], and other noncombustible matter that are contained in [[coal]].
'''Ash''' is an impurity 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 increases the weight of coal, adds to the cost of handling, and can affect its burning characteristics.
[[Category:Energy]]
[[Category:Energy]]