This study analyzes the effect of moisture content and compression pressure on bed void fraction in different materials. The void fractions of several materials, both spherical and non-spherical, solid and porous, with different particle sizes and densities, were evaluated as functions of moisture content and compression pressure. In our previous study, the Archimedes number was found to be an appropriate parameter to describe particle behavior. In this study, the Archimedes number was found to be an appropriate non-dimensional number to describe the effects of moisture content and compression pressure. A general equation was developed to evaluate the effect of moisture content on liquid bridge forces in solid and porous particles. Furthermore, a general equation was developed based on the Heckel model to describe compressed particulate beds. Finally, we studied the compression of wet particles. The general equations presented in this study agree well with the experimental values. (C) 2020 Elsevier B.V. All rights reserved.