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

    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 using quantum …

  2. 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 and …

  3. 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

  4. 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 of molecules.

  5. 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.…

  6. Quantum | Definition & Facts | Britannica

    Quantum, in physics, discrete natural unit, or packet, of energy, charge, angular momentum, or other physical property. Light, for example, appearing in some respects as a continuous electromagnetic …

  7. Physics - Nuclear, Particles, Forces | Britannica

    Oct 13, 2025 · Physics - Nuclear, Particles, Forces: This branch of physics deals with the structure of the atomic nucleus and the radiation from unstable nuclei.

  8. Physics - Quantum Mechanics, Particles, Waves | Britannica

    The forefront of contemporary advances in physics lies in the submicroscopic regime, whether it be in atomic, nuclear, condensed-matter, plasma, or particle physics, or in quantum optics, or even in the …

  9. Quantum mechanics | Definition, Development, & Equations | Britannica

    Nov 14, 2025 · The study of quantum mechanics is rewarding for several reasons. First, it illustrates the essential methodology of physics. Second, it has been enormously successful in giving correct …

  10. Momentum | Definition, Examples, & Facts | Britannica

    Nov 19, 2025 · conservation of momentum, general law of physics according to which the quantity called momentum that characterizes motion never changes in an isolated collection of objects; that is, the …