The porosity of the kernels is less than the seeds. However, the results are different as per a report by Sirisomboon et al. and Karaj and Müller [31,76]. In addition, Sirisomboon et al. [76] reported the static coefficient of friction of the kernels was the highest of all the surfaces studied as compared to the fruits and seeds. This is because the kernels are softer and have a viscous surface and thus are more difficult to move within a machine [76]. Unlike the kernels, the whole seed is harder and has a slippery surface which enables it to move easily on a plane surface [76].