It is stated that the Andrensen equation fits for the particle size distribution (PSD) of a dense package powder and the Rosin-Rammler-Bennett equation fits for the PSD of an actual cement powder, respectively.

• 粉体的最紧密堆积要求其粒径分布服从Andrensen方程,而实际水泥粉体的粒径分布则服从Rosin-Rammler-Bennet方程。