Basic Concepts of Modern Physics is an essential introduction for all those who are interested in gaining a better understanding of modern physics. In this unique text, Georg Unger provides clear descriptions of the conceptual bases of twentieth-century physics, including quantum mechanics, particles, and relativity theory, as well as other aspects relating to key physical concepts to phenomena.

Recognizing that quantum mechanical phenomena occur at a boundary between the experienced world and a concurrent world of “subnature” that is not perceptible to the senses, Dr. Unger provides a radical, non-reductionist concept of modern physics that is open to spiritual understanding.

“We should go into a short contemplation of certain habits of thinking and ask: What expresses itself in this adherence to the nineteenth-century idea of matter? To say it radically—and thereby naturally be open to misunderstanding—it is a weakness of thinking characteristic of our times.” — Georg Unger

This book is a translation from German of Grundbegriffe der modernen Physik Quanten, Teilchen, Relativität: Vom Bilden physikalischer Begriffe – Teil III (Verlag Freies Geistesleben, 1967). An earlier English edition was published as Forming Concepts in Physics (Parker Courtney Press, 1995). COVER MAGES: Albert Einstein (1879–1955) in1921, by Ferdinand Schmutzer; Neils Bohr (1885–1962) in 1925, by Bettmann; Paul Dirac (1902–1984) by Emilio Segrè, Visual Archives, W. F. Meggers Gallery of Nobel Laureates Collection, American Institute of Physics, College Park, MD; Max Planck (1858–1947), Bundesarchiv, Koblenz, Germany.