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  1. Physics | Definition, Types, Topics, Importance, & Facts | Britannica

    6 days ago · Physics is the branch of science that deals with the structure of matter and how the fundamental constituents of the universe interact. It studies objects ranging from the very small …

  2. Physics Definition & Meaning | Britannica Dictionary

    PHYSICS meaning: a science that deals with matter and energy and the way they act on each other in heat, light, electricity, and sound

  3. Psychic Definition & Meaning | Britannica Dictionary

    : a person who has strange mental powers and abilities (such as the ability to predict the future, to know what other people are thinking, or to receive messages from dead people) : a person …

  4. Physics Portal | Britannica

    Physics, the basic physical science, studies objects ranging from the very small (using quantum mechanics) to the entire universe (using general relativity). It deals with the structure of matter …

  5. Quantum mechanics | Definition, Development, & Equations

    Dec 18, 2025 · It is important to realize that quantum mechanics is a branch of physics and that the business of physics is to describe and account for the way the world—on both the large …

  6. Physical science | Definition, History, & Topics | Britannica

    As it developed in the 20th century, physics is concerned with the structure and behaviour of individual atoms and their components, while chemistry deals with the properties and reactions …

  7. Physics - Nuclear, Particles, Forces | Britannica

    6 days ago · One of the most significant branches of contemporary physics is the study of the fundamental subatomic constituents of matter, the elementary particles. This field, also called …

  8. physics - Kids | Britannica Kids | Homework Help

    Physics is one of the major branches of science. People who work in physics are called physicists. Physicists study matter and the forces (pushes or pulls) that act on it.…

  9. Mass | Definition, Units, & Facts | Britannica

    Dec 18, 2025 · Mass, in physics, quantitative measure of inertia, a fundamental property of all matter. It is, in effect, the resistance that a body of matter offers to a change in its speed or …

  10. Particle physics | Elementary Particles, Quarks & Hadrons | Britannica

    Dec 9, 2025 · Particle physics, Study of the fundamental subatomic particles, including both matter (and antimatter) and the carrier particles of the fundamental interactions as described …