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Pleau and Pigeon Equation

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.