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  1. 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

  2. physics summary | Britannica

    physics, Science that deals with the structure of matter and the interactions between the fundamental constituents of the observable universe.

  3. Internal energy | Definition & Facts | Britannica

    Yes, thermodynamics is a branch of physics that studies how energy changes in a system. The key insight of thermodynamics is that heat is a form of energy that corresponds to mechanical work (that …

  4. Entropy | Definition & Equation | Britannica

    Nov 7, 2025 · Its introduction by the German physicist Rudolf Clausius in 1850 is a highlight of 19th-century physics. The idea of entropy provides a mathematical way to encode the intuitive notion of …

  5. Thermodynamics | Laws, Definition, & Equations | Britannica

    Oct 15, 2025 · Yes, thermodynamics is a branch of physics that studies how energy changes in a system. The key insight of thermodynamics is that heat is a form of energy that corresponds to …

  6. Calorie | Definition & Measurement | Britannica

    Nov 13, 2025 · Because the quantity of heat represented by the calorie is known to differ at different temperatures (by as much as 1 percent), it has consequently been necessary to define the …

  7. Faraday’s law of induction | Definition, Formula, & Facts | Britannica

    Nov 19, 2025 · Faraday’s law of induction, in physics, a quantitative relationship expressing that a changing magnetic field induces a voltage in a circuit, developed on the basis of experimental …

  8. Electromagnetic induction | physics | Britannica

    Nov 6, 2025 · electromagnetic induction, in physics, the induction of an electromotive force in a circuit by varying the magnetic flux linked with the circuit. See Faraday’s law of induction.

  9. Aristotle - Physics, Metaphysics, Logic | Britannica

    Nov 25, 2025 · The most important axioms, Aristotle thought, would be those that define the proper subject matter of a science (thus, among the axioms of geometry would be the definition of a …

  10. Loudness | Acoustics & Perception of Sound | Britannica

    As in the case of the definition of the phon, the average values from observations by a large number of people would then define the details of the scale for purposes of classifying and measuring sound …