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<p><a href="page.php?w=charring">charring</a> of wood. In general, pyrolysis of organic substances produces volatile products and leaves <a href="page.php?w=Char_%28chemistry%29">char</a>, a carbon-rich solid residue. Extreme pyrolysis, which leaves mostly <a href="page.php?w=carbon">carbon</a> as the residue, is called <a href="page.php?w=carbonization">carbonization</a>. Pyrolysis is considered one of the steps in the processes of <a href="page.php?w=gasification">gasification</a> or <a href="page.php?w=combustion">combustion</a>.  Compared to</p><p>
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