A tag is a keyword or label that categorizes your question with other, similar questions. Using the right tags makes it easier for others to find and answer your question.

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Light Amplification by Stimulated Emission of Radiation. A means of creating coherent light by either driving an atomic or molecular transition in an optical cavity or firing a beam of electrons throu…
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a branch of abstract algebra. A group is a set of objects, together with a binary operation, that satisfies four axioms. The set must be closed under the operation and contain an ident…
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Interaction between two or more bodies that results in physical contact and an exchange of momentum between the bodies involved.
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standards of measurement used for different types of quantities.
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questions concerning measurements, experiments, and activities that demonstrate physics and are safe to do at home, require at most one tool or ingredient not readily available, and can be interpreted…
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Study of macroscopic and microscopic phenomena in chemical systems in terms of physical laws and concepts [thermodynamics, statistical mechanics, kinetic theory, quantum mechanics...].
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The product of the force on an object and the displacement the object undergoes along the direction of the force.
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Object moving through space due to the exertion of a force.
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The temperature-dependant emission of electromagnetic waves. Combine this tag with [tag:thermodynamics] for a macroscopic view or [tag:quantum-mechanics] for a microscopic explanation.
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an almost perfectly symmetric yellow dwarf star [spectral class G2V] which is at the center of our Solar System.
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for dimensions of a manifold, typically the space-time. DO NOT USE THIS TAG for dimension of a physical quantity.
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to electrical resistance. DO NOT USE THIS TAG for non-electrical resistance.
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is used in situations where the question is either about how some term or concept is define or where the validity of an answer depends on a subtle definition of some term or concept…
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"Faster-than-light", also known as superluminal velocities, refers to any sort of travel at a speed greater than the speed of light. Prohibited in mainstream physics due to the Special theory of …
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A region of space devoid of any fluid molecules resulting in a zero pressure in ideal cases. In practice, even space has a small but finite number of molecules.
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for questions about the exact nature of wavefunction collapse.
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the transmission of current with no resistive losses, and is one of the most active areas of condensed matter physics research.
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The tendency of a force to rotate an object about an arbitrary axis.
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the quantum field theory believed to describe the strong nuclear force.
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the energy of a body or a system due to the position of the body or the arrangement of the particles of the system.
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Polarization characterizes the oscillations in time the electromagnetic field is doing in the plane perpendicular to the propagation direction of a wave
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The Sun plus the collection of bodies in orbit around the Sun such as planets, dwarf planets, moons, asteroids, comets, etc.
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the unit of measurement for electronic potential, from one point location to another.
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Change in the direction of propagation of a wave when its transmitting medium changes.
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A subset of [tag:fluid-dynamics] concerning primarily forces such as lift and drag generated on bodies as they move through gasses or as gasses move through the body (typically air).
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a layer of gases that surround it, permitting life and protecting life by absorbing ultraviolet solar radiation, warming the surface by retaining the heat and mitigating the temp…
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must be answered in a manner that can be understood by a general audience with at most a basic understanding of physics, mathematics and related sciences. Apply it to questions w…
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To be used for questions on geometry closely pertaining to physics. Includes differential geometry and euclidean geometry.
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Subdiscipline of theoretical physics which consists in the study of physics problems using numerical algorithms. PLEASE NOTE that questions about computational methods and/or programming are OFF-TOPIC…
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the practice of separating a signal by frequency (or sometimes energy or momentum) and analyzing the resulting spectrum.
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