This newly updated dictionary provides clear and concise definitions of some 4500 terms and concepts, drawn from every area of physics. Ranging from optics and acoustics to mechanics and electronics, via quantum theory and relativity, it forms the ideal reference guide to a fast-evolving subject, and will prove invaluable to students and teachers, scientists and doctors, and technicians and technologists. — Comprehensive coverage of the terminology of contemporary physics, from absolute zero and Avogrado constant to Zeeman effect and zero-point energy — Articles on related scientific fields, such as physical chemistry, astronomy, medical physics, computing and engineering — Many new entries, including CT scan, squeezed states, Yang-Mills theory and Weinberg angle — Numerous explanatory diagrams, and an appendix of scientific tables and symbols