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For lognormally distributed sphere radii, the Pleau and Pigeon normalization
factor *K'(0)*
is in error by 58% at an air volume of nearly 20%. This error is
reflected in the performance of *K*_{A} and
*K*_{K'}. For the case of
lognormally distributed sphere radii, the equation
*K*_{A}, which uses the
correct air content, performs better than *K*_{K'}. This is in contrast
to the monosized sphere case. Also, for lognormally distributed sphere
radii, the Pleau and Pigeon equation overestimates percentiles, where as
the equation underestimates percentiles of the monosized sphere radii.