Figure 3
From: Attractive particle interaction forces and packing density of fine glass powders

Packing fraction as a function of the average particle size.
Empty symbols show experimental results for samples a–i, each corresponding to a different particle size distribution, specified by Fig. 1 and Tab. I. Results of the simulation are shown by filled symbols: Circles: no attractive forces; diamonds: with adhesion (JKR model); squares: with both adhesion and non-bonded van der Waals interactions. The lines show the best fit to the data using Eq. (12).