'''Quantum''' mechanics is a set of principles underlying the most fundamental known description of all physical systems at the microscopic scale (at the Videx:atomic level). Notable amongst these principles are both a dual [Videx:wave wave]-like and particle-like behavior of Videx:matter and Videx:radiation, and prediction of probabilities in situations where classical Media:physics predicts certainties. Classical physics can be derived as a good approximation to quantum physics, typically in circumstances with large numbers of Videx:particles. |