Thales and the Atomic Theory Prepared by Yıldız Dizay Kaya • modern atomic theory: an atom consists of a nucleus and electrons orbiting around it. • orbits: trajectories on which electrons can sit. • orbits can be calculated using quantum mechanics. The Bohr atom model • Modern theory of atoms: it took centuries for human beings to reach. • Many contributions by different scientists and philosophers. • Thales made a great progress in his time about the structure of matter. • lived about 600’s b.c. • He was born in the city of Miletus (It is the Milet town in the city of Aydın) • The dates of his life is not known precisely. Thales • He was not only a thinker, he was involved business and politics. • Acoording to Heredotus’ history: Thales predicted the eclipse of the sun. The Theater of Miletus • had been well known person in the early part of the 6. century b.c. • Arsitotle: Thales is first philisopher in the Greek tradition. • Bertnard Russell: The western philisophy begins with Thales. • Thales and geometry: There is a theorem in geometry called Thales’ theorem about similar triangles. Thales’ Theorem Thales and the atomic theory: • Aristotle: according to Thales the earth is superimposed upon water • Thales: the primary building blocks of all things to be water. • Therefore, he thought “things” as varying forms of one primary and ultimate element. • Of course, today we know that his ideas about water is wrong. • However, he actually suggested the same working hypothesis of modern atomic theory that all things are made up of atoms. • Historically, it is very important for a philosopher to think that things have a common building block. • Based on this, many claim that Thales is the father of both philosophy and physics References: • http://en.wikipedia.org/wiki/Thales • http://www.rain.org/~rcurtis/thales.html • http://www.bookrags.com/research/atomictheory-woc/ • http://galileoandeinstein.physics.virginia.edu/l ectures/thales.html Thanks for listening and your attention!