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

    Feb 6, 2026 · 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 …

  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

    Feb 4, 2026 · 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 …

  7. Vector | Definition, Physics, & Facts | Britannica

    Vector, in physics, a quantity that has both magnitude and direction. It is typically represented by an arrow whose direction is the same as that of the quantity and whose length is proportional to the …

  8. 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 position upon the …

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

    Jan 30, 2026 · 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. Work | Definition, Formula, & Units | Britannica

    Work, in physics, measure of energy transfer that occurs when an object is moved over a distance by an external force at least part of which is applied in the direction of the displacement. The units in which …