# Tags

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.

 Type to find tags:
 laser× 309 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… conformal-field-theory× 309 metric-tensor× 300 The variables used in general relativity to describe the shape of spacetime. If your question is about metric units, use the tag "units", and/or "si-units" if it is about the SI system specifically. field-theory× 295 units× 295 standards of measurement used for different types of quantities. projectile× 294 Object moving through space due to the exertion of a force. capacitance× 282 The ability of an object to store electric charge. atoms× 273 A nucleus made of protons and neutrons surrounded by a cloud of electrons equal in number to the protons. space× 272 The near-vacuum extending between the planets and stars, containing small amounts of gas and dust. Also called outer space to refer to the physical universe beyond the Earth's atmosphere. planets× 269 Celestial body that orbits following an elliptical path around a star or stellar remnant. superconductivity× 265 the transmission of current with no resistive losses, and is one of the most active areas of condensed matter physics research. torque× 265 The tendency of a force to rotate an object about an arbitrary axis. classical-electrodynamics× 261 mathematics× 257 just because your question involves math! If your question is on simplification of a mathematical expression, please ask it at math.stackexchange.com The mathematics tag covers non… voltage× 255 the unit of measurement for electronic potential, from one point location to another. refraction× 255 Change in the direction of propagation of a wave when its transmitting medium changes. group-representations× 254 definition× 253 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… physical-chemistry× 253 Study of macroscopic and microscopic phenomena in chemical systems in terms of physical laws and concepts [thermodynamics, statistical mechanics, kinetic theory, quantum mechanics...]. home-experiment× 250 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… measurement-problem× 248 for questions about the exact nature of wavefunction collapse. faster-than-light× 248 "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 … tensors× 248 curvature× 247 Use this for questions pertaining to curvature of manifolds. Does not need to be specific to general relativity, but also for curvature of e.g. a [tag:calabi-yau] manifold. thermal-radiation× 243 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. fourier-transform× 241 A unitary linear operator which resolves a function on $\mathbb{R}^N$ into a linear superposition of "plane wave functions". Most often used in physics for calcalating the response of a time shift inv… probability× 239 sun× 238 an almost perfectly symmetric yellow dwarf star [spectral class G2V] which is at the center of our Solar System. vacuum× 236 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. quantum-chromodynamics× 231 the quantum field theory believed to describe the strong nuclear force. air× 231 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… double-slit-experiment× 230 The double slit experiment involves passing light through two parallel slits to demonstrate that the light from one slit interferes with that from the other. frequency× 230 the rate of repetitive aspect in the amplitude over a given dimension. geometry× 227 To be used for questions on geometry closely pertaining to physics. Includes differential geometry and euclidean geometry. coordinate-systems× 226 quantify location in space. aerodynamics× 226 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).