Energy, namely, electrical and thermal energy; carbonaceous by-products from the production of energy, namely, coal, charcoal, and char, namely, the solid material that remains after light gases and tar have been released from the coal particle during the initial stage of combustion

'by-product':8 'carbonac':7 'char':20 'charcoal':18 'coal':17,37 'combust':44 'electr':3 'energi':1,6,15 'gase':29 'initi':41 'light':28 'materi':24 'name':2,16,21 'particl':38 'product':10,13 'releas':34 'remain':26 'solid':23 'stage':42 'tar':31 'thermal':5

E=BC²

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