THE BIRTH OF THE ATOMIC THEORY IN GREECE OF THE 5TH B.C. CENTURY

One of the most important achievements of ancient Greek thought of the 5th century BC was undoubtedly the genesis of the concept of the atom, this tiny amount of matter that has occupied scientists and philosophers for thousands of years.

The important current that first conceived this idea was the atomic philosophy. Its representatives studied with the "Dorian" Eleatan philosophers but also opposed them. They therefore accepted the doctrine of their teachers that "BEING" is unborn and incorruptible but at the same time claimed that it moves and is divided.

Atomic philosophers first acknowledged the coexistence of emptiness and non-emptiness in the universe. The existence of a vacuum is a necessary condition for the possibility of division of physical bodies. However, they rejected the view of Zeno the Eleat about the infinite division of bodies. That is, they supported the existence of finite molecules of matter, which can not be further cut and remain atoms. Thus the theory of the atom was conceived.

The most important atomic philosopher was Democritus (470/460 - 400/390 BC) from Abdera in Thrace, the most versatile and methodical mind before Aristotle. He dealt with issues of physics, epistemology, human behavior, social and political organization.

Democritus defined the atom as unborn, incorruptible, unchangeable, complete and perfect, uniformly compact, free from emptiness, simple, unified and amorphous, without fluctuations, dilutions and densities or expansions and contractions, indivisible and with definite boundaries. In his opinion, atoms were infinite in number and shapes and moved eternally into space.

An important difference between the theory of Democritus and that of the Eleats was that the former meant substance not metaphysically but materially. At the same time, he considered the phenomena of nature not as an illusion of people but as something that happens around the essence.

As for how a world is created, Democritus taught that it is composed when in a large space void many atoms collide with each other to form a vortex. In the vortex, similar atoms are attracted to each other and form known physical bodies such as fire, water, air and earth. Then the heavier materials gather in the center and create the earth while the lighter ones are pushed towards the periphery creating the celestial bodies and the meteorological phenomena. Thus infinite worlds are synthesized and decomposed. In fact, he defined as their way of destruction the fall of one world over another. Finally, he argued that in some worlds there is no sun and moon while in others there are many such celestial bodies. In addition, the philosopher believed that in many worlds there are no liquids, animals and plants.

Democritus also formulated positions in the field of biology. Thus he argued that the skills and organs of the various animals were created by chance and that only those organs that seemed necessary to preserve each species were saved. The philosopher also considered every living organism as a small world.

As for the soul, Democritus considered it as a physical body, with a composition like fire, he identified it with the mind and believed that it wears together with the body.

For knowledge, the philosopher taught that it is related to the situations that surround each person and that the truth is at the bottom, that is, in the void and in atoms. The process of knowledge was for him a natural mechanism, which in fact was based on the "dark" sense and the "genuine" intellect. For the second to exist, a necessary condition was the existence of the first, as Aristotle later believed.

Finally, a characteristic formulation of the philosopher about the importance of teaching was this: "Teaching is close to nature because it restructures human nature and thus creates a new nature."

Today, about 300 excerpts from numerous books by Democritus survive.

4 ANCIENT GREEK PHILOSOPHERS SEARCH FOR THE PRINCIPLE OF THE WORLD

The archaic era of Greek history was very important for the evolution of Greek and European culture. The main reason is that then the foundations of philosophical thought were laid. The general social and political conditions in the life of the Greeks contributed in this direction. In the 6th century BC the kingdom and the aristocracy were set aside. New social classes, such as those of the merchants and artisans, emerged between the ranks of the wealthy landowners and the poor workers. In the context of social change, the way of thinking has changed. Belief in myth ceased and the human mind began to wonder about nature, spirit, knowledge, practice, society and the law. A special field of intellectual creation that is a testimony to the new spiritual interests of the Greeks of the archaic period is their lyric poetry.

Until the 6th century BC the Greeks tried to attribute the creation of the world to anthropomorphic deities, for whom they had created a rich set of myths. The first steps of philosophy were based on these myths. So the first perception of the series of events that gave birth to the world was this:

1) Initially there was a chaotic situation.

2) The chaotic state was fertilized by some sperm.

3) The produced material result was divided into parts.

4) Then the celestial bodies and the phenomena were formed.

5) Life was born.

The first important philosopher to attempt to interpret the world was Thales (625-546). He considered water as the beginning of the world. After traveling to the east gaining rich knowledge, he systematically engaged in astronomy, mathematics, geography and engineering. In place of the mythical deities of the seas and rivers, he put the natural element of water as part of the world, arguing that it has life in it and favors its development.

In 610 - 546 BC the philosopher Anaximander also lived. He set "Infinity" as the beginning of the world, which expressed the physical existence of the mythical entities Chaos, Night, Air, Ocean. Beginning with infinity, Anaximander proceeded to formulate the concept of the Incorruptibility of Matter.

Anaximander's version of the creation of the world is interesting. He considered that from "infinity" was secreted the "fertile", that is, the sperm of the hot and the cold. Thus a cold nucleus that eventually formed the earth's mass was surrounded by warm material, which exploded creating the rest of the celestial bodies. Anaximander considered temperature transitions as a mechanism for the creation of life. Finally, Anaximander was the first to claim that man came from other species of animals.

Anaximenes (585-525 BC) considered air as a basic element of the world and believed that all material bodies and natural phenomena are created by its thickening and dilution. By air he meant matter and energy together. He also taught that the air was before the birth of the universe and remains forever its basic essence, advancing the issue of cosmogony in cosmology. Considering hot, cold, wet and dry as states of the air, he tried to understand the qualities of matter and the explanations of quantities.

Heraclitus (540-480 BC) was the fourth and most important materialist philosopher of the archaic era. This philosopher considered the universe as a fire that transforms into various forms. He also taught that "Τhis world, the same for all in general, neither god nor man made it but it has always been and is will be an eternal fire, which lights up in moderation and goes out in moderation."

Explaining the structure of the world, the philosopher formulated the notion that fire first turns into sea and half of it into land while the other half into currents. All this becomes fire again.

One of the well-known views of Heraclitus was that "Everything changes and nothing remains constant."