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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mechanics× 276
General questions about the way objects move and interact. This tag should be used when the tags for certain kinds of mechanics (newtonian-mechanics, classical-mechanics, quantum-mechanics, etc.) are …
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nuclear-physics× 273
the study of the composition, behavior and interaction of atomic nuclei and their constituent parts.
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kinematics× 272
The description of the movement of bodies by their position, velocity, acceleration (and possibly higher time derivatives, such as, jerk) without concern for the underlying dynamics/forces/causes.
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spacetime× 269
As a consequence of the Lorentz transformations, time and space transform into each other when changing reference frame. This calls for a unified description: Minkowski spacetime.
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quantum-gravity× 253
Any of the various explanations of gravity as a quantum theory, including string theory and loop quantum gravity.
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photons× 251
electromagnetic waves. They exhibit particle-like qualities in many situations and have zero rest mass.
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quantum-information× 243
the study of the informational content of quantum states. The most common object of study is the "qubit", the information in a two-state quantum system such as spin-1/2 or photo…
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time× 230
defined operationally to be that which is measured by clocks. The SI unit of time is the second, which is defined to be
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energy-conservation× 225
The law of conservation of energy, which states that the amount of energy in a system is constant. For questions about Earth's environment, see the climate-science tag instead.
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supersymmetry× 222 |
water× 222
Two Hydrogen atoms covalently bonded to one Oxygen atom. One of the more common compounds on the surface of the earth.
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angular-momentum× 221
The conserved quantity arising from a rotational invariance. Combine with rotational-dynamics for the classical mechanics approach and quantum-mechanics for the QM interpretation
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lagrangian-formalism× 219
For questions involving the Lagrangian formulation of a dynamical system. Namely, the application of an action principle to a suitably chosen Lagrangian or Lagrangian Density in order to obtain the eq…
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momentum× 211
In introductory mechanics, the momentum of a particle is its mass times its velocity. In electrodynamics, the momentum of a field is proportional to the cross-product of the electric field with the ma…
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acoustics× 209
the interdisciplinary science that deals with the study of all mechanical waves in gases, liquids, and solids including vibration, sound, ultrasound and infrasound. Applications of acoust…
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temperature× 207
It's the physical property that indicates the degree/intensity of heat present in a substance or an object. It can be expressed and measured according to various scales.
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solid-state-physics× 207
Solid-state physics studies how macroscopic properties of solids (mechanical, electrical, optical, etc.) result from their microscopic structure. It usually deals with the scale where quantum properti…
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books× 201
off topic now, ask your question in chat instead.
Questions asking "What is a good book about X?" or more generally, "What should I read to learn about X?", typically wher…
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pressure× 197
Force per unit area.
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acceleration× 194
The rate of change of velocity of a body per unit of time.
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| universe× 191 |
standard-model× 189
A model of the basic particles and forces featuring six quarks, three charged leptons, three massless neutral leptons and four fundamental force carrying bosons. The twelve fermions are arranged into …
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symmetry× 187 |
entropy× 187
A important property of all systems in thermodynamics and statistical mechanics. Entropy characterizes the degree to which the energy of the system is *not* available to do useful work
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education× 187
physics taught and learned. Teaching strategies, class examples and demonstrations; learning resources, career advice, etc. For explicit problems, use the 'homework' tag instead.
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electric-circuits× 186 | quantum-interpretations× 181 |
differential-geometry× 177
Mathematical discipline which uses the techniques of calculus to study geometric problems. General relativity is written in this language.
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| orbital-motion× 175 |
space× 174
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.
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terminology× 173
Use this for questions relating to the proper use of physics terminology or nomenclature.
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friction× 173
The resistance a surface or object encounters when moving over another.
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rotational-dynamics× 171
A tag for questions about the mechanical interactions of rotating objects, including torque and angular momentum.
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quantum-electrodynamics× 170
the quantum field theory believed to describe the electromagnetic interaction (and with some extension the weak nuclear force).
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spin× 168
Fundamental characteristic property of particles which together with orbital angular momentum acts as the generator of rotations and which doesn't have a classical equivalent but is sometimes compared…
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wavefunction× 162
A complex scalar field that describes a quantum mechanical system. The square of the modulus of the wave function gives the probability of the system to be found in a particular state.
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