The form and size of the feedstock and pyrolysis product may affect the quality and potential
uses for the biochar product. Initially, the ratio of exposed to total-surface-area of biochar is
affected by its particle size. However, although low temperature biochar is stronger than high
temperature products, it is brittle and prone to abrade into fine fractions once incorporated.
Thus, over the long term, surface area, i.e. of weathered biochar, may not be greatly affected
by this parameter.