Heating value of wood and bark The dry mass of wood and bark averages 48 %–52 % carbon, 38 %–42 % oxygen, 6.0 %–6.5 % hydrogen, 0.2 %–0.5 % nitrogen, and 0.3 %–5 % mineral elements. Softwoods typically have a slightly higher content of carbon than hardwoods, and bark always has a considerably higher content
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