Any very small part or body of something is called a particle. Examples of particles that we can give are mineral grains and subatomic particles..
In the case of grain, it is because its entire structure is made up of very small elements, grains and that are almost imperceptible to the human eye. The size of the grain or particle can range from the smallest, such as a few nanometers, to several millimeters, but it never exceeds this average. The beaches provide a good example of what I was saying, since they are made up of thousands and thousands of loose particles (grains), although at a distance and in a global vision they give that compact sensation. When we approach and touch it we can verify this question.
Too, The term particle has a completely different application than the one mentioned above, since in the field of grammar it is common to use this word to designate those invariable parts of a sentence or those that serve to explain the relationships that occur between different phrases or the element used to form certain words, as the term sub division, in this case, sub, will be particle.
