Physics Dictionary

Physics Dictionary explains more than 700 physics terms in clear, plain English, from aberration to the zeroth law of thermodynamics. Every entry gives a short definition, the symbol and SI unit where they apply, a key formula when it helps, and "See also" links to related terms.

What the app covers

• A–Z Dictionary: one page per letter, each with a filter box so you can find any term in seconds

• Browse by Topic: every term grouped into Mechanics; Oscillations, Waves and Sound; Heat and Thermodynamics; Electricity and Magnetism; Light and Optics; Modern Physics; and Measurement and Math Tools

• Key drawings on each topic page: circular motion, a free-body diagram on an incline, wave and standing-wave diagrams, a pressure–volume diagram, a heat engine, series and parallel circuits, the magnetic field of a wire, a lens ray diagram, total internal reflection, hydrogen energy levels, the electromagnetic spectrum, accuracy and precision, and vector addition

• SI Units and Constants: the seven base units and their defining constants, the 22 derived units with special names, CODATA 2022 physical constants from NIST, and common non-SI units

• SI Prefixes and Greek Letters: all prefixes from quecto to quetta, and the Greek alphabet with the quantities each letter usually stands for

Made for studying

• Original definitions written for students, with every symbol explained

• Typeset formulas that stay sharp on any screen

• Sign conventions stated where books differ

• Search across the whole app and a filter on every letter page

• Dark mode

• Works offline, with no account needed

• Available in 8 languages: English, Español, Português, Français, Deutsch, العربية, हिन्दी and Bahasa Indonesia; terms can be found by their English or translated name

Useful for school physics, AP, A-level and IB courses, and introductory college and university physics. Definitions, units and constants are checked against the OpenStax University Physics textbooks, the NIST CODATA 2022 values and the SI Brochure.

This app is an independent study aid. It is not affiliated with any exam board, textbook publisher or standards body.