crystallite is the average size of the particle whereas the particle size denotes the individual size of the particle.

The mass and size of an alpha particle compare with the masa and size of beta particle in the sense that the alpha particle is significantly larger in both size and mass that the beta and gamma particles. This is why it is called the alpha particle.

Particle size depends on the type of particle.

what is bed load particle size

As particle size in increases, capillarity decreases