The Encyclopaedic Dictionary of Physics is an effort to keep pace with continuing rapid developments and expanding vocabularies in various branches of Physics such as Properties of Matter, Heat Light, Sound, Electronics, Electricity and Magnetism, Modern Physics, Nuclear Physics, Quantum Mechanics, Classical Mechanics, Spectroscopy and Solid-State Physics. This dictionary has been encyclopaedic in its contents and presentation style. Wherever necessary, the terms have been explained with illustration and mathematical expressions. The dictionary is designed to serve as a ready reference for undergraduate and post-graduate students and for those appearing for competitive examinations, besides the research scholars, teachers and scientists. The entries have been written in a clear and explanatory style to provide both straight forward definitions and valuable background information. Undoubtedly, this encyclopaedic Dictionary will be of utmost use for one and all.