All particles can be classified into two broad categories: leptons and hadrons. The main difference between the two is whether they interact through the strong interaction. Hadrons are particles that interact through all four fundamental interactions of nature, which include, strong, electromagnetic, weak, and gravitational interactions.
Hadrons, the strongly interacting particles, can be further subdivided into two classes based on their internal composition: mesons and baryons. Originally, mesons and baryons were classified according to their
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showed last 75 words of 1195 total
and making highly accurate measurements, they will discover some way in which the model begins to break down and thereby find a more complete theory. This may prove to be what is known as a grand unified theory, which uses a single theoretical structure to describe the strong, weak, and electromagnetic forces.
We are seeing only the conceptual results of this very mathematical theory, but we should realize that is it based on experimental evidence.