The particulate nature of matter explains the behavior of particles during diffusion by highlighting that matter is composed of tiny particles in constant, random motion. This random motion causes particles to spread out from areas of higher concentration to areas of lower concentration, leading to diffusion. The particulate model helps understand that particles collide with each other and move in all directions, but because there are more particles in the high concentration area, the net movement is toward the low concentration area. This explanation is supported by the kinetic theory of matter, which shows that diffusion happens without external direction but because of the random movement and collision of particles. The particles' movement and spreading account for the mixing process observed during diffusion.
In summary, the particulate nature clarifies diffusion as a process driven by the microscopic behavior of constantly moving particles and their tendency to move from crowded to less crowded regions until equilibrium is reached.
