An Encyclopaedia of Science is a comprehensive, organized reference work that covers a wide array of scientific disciplines, providing detailed information on concepts, theories, historical developments, key figures, and significant discoveries. Typically organized alphabetically or by topic, it encompasses fields such as physics, chemistry, biology, earth sciences, astronomy, and technology.

These encyclopedias aim to make complex scientific knowledge accessible to a broad audience, from students to professionals, often explaining terms, offering diagrams, and summarizing important research. They are invaluable for anyone seeking a well-rounded understanding of scientific principles and advancements.