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:
× 196
A tag for questions about rotational motion, including angular velocity and angular acceleration.
× 196
the magnitude of velocity.
× 195
The study of the composition or dynamics of the gaseous layers around planets, often applied to questions on Earth's atmosphere but can be applicable to all planets & moons in the solar system.
× 194
Massive systems held together by gravitational attraction, consisting of stellar associations, star systems, star clusters and types of interstellar clouds, stellar remnants, gasses, cosmic dust and a…
× 193
A theorem that relates continuous symmetries (continuous transformations that don't affect the value of the lagrangian) to quantities conserved in time.
× 193 × 193 × 189
× 185
Dimensional analysis means to obtain results by analyzing the units in question, etc. DO NOT USE THIS TAG if your question is about degrees of freedom or spatial dimensions.
× 182
Cosmological inflation refers to an era of expansion that lasted for approximately $10^{-34}$ seconds, during which the universe expanded by a factor of approximately $10^26$ in every direction. This …
× 182 × 180
× 180
To be used for linear algebra, and closely related disciplines such as tensor algebras and maybe clifford algebras.
× 180
This higgs field breaks electroweak symmetry and provides mass to particles though a process called the higgs mechanism. The excitation of the higgs field is called a higgs boson.
× 179 × 179
Colloquially referred to as one of the hardest professions, rocket science is actually a common name for spacecraft/space-systems engineering. However, one can also generalize this to include all form…
× 175 × 172
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…
× 172
a special case of the holographic principle. It states that a quantum gravitating theory in Anti-de-Sitter (AdS) space is exactly equivalent to the gauge theory/Conformal Field Theory (CFT…
× 171
the integral of the Lagrangian over time, or the integral of the Lagrangian Density over both time and space.
× 171 × 170 × 168
Perturbation theory refers to methods for understanding physical systems by treating them as small modifications to exactly solvable systems.
× 166
× 165
defined as the mass per unit volume of a substance.
× 165
A rank-2 tensor in relativity, which expresses the flux of energy-momentum along timelike and spacelike axes. Also known as the energy-momentum tensor. In the Einstein field equations, it is the sourc…
× 163 × 161
Analysis of a system of bodies where all forces are in balance and there is no motion relative to a chosen reference frame.
× 161
The property of some materials by which individual atoms decay, emitting energy or particles often transforming into different elements in the process.
× 160
The study of the physical processes and properties of the planet Earth. Applicable to many subjects about Earth, such as its shape, its magnetic field, and ocean currents.
× 156 × 155
× 154
the unknown form of energy that drives the acceleration of the universe's expansion.
× 154
Surface tension occurs due to the tendency of liquid molecules to favor their own kind. Surface tension is important in fluid multiphase systems typically at small length and velocity
× 153
Theory, experiments and calculations related the physics of plasmas, i.e., matter constituted by ionized atoms.
× 153