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In thermodynamics, entropy is a numerical quantity that shows that many physical processes can go in only one direction in time. For example, cream and...

In optics, aberration is a property of optical systems, such as lenses, that causes light to be spread out over some region of space rather than focused...

In physics, a coupling constant or gauge coupling parameter (or, more simply, a coupling), is a number that determines the strength of the force exerted...

A corona discharge is an electrical discharge caused by the ionization of a fluid such as air surrounding a conductor carrying a high voltage. It represents...

Physics World is the membership magazine of the Institute of Physics, one of the largest physical societies in the world. It is an international monthly...

A photometer is an instrument that measures the strength of electromagnetic radiation in the range from ultraviolet to infrared and including the visible...

The German Physical Society (German: Deutsche Physikalische Gesellschaft, DPG) is the oldest organisation of physicists. As of 2022, the DPG's worldwide...

There are various mathematical descriptions of the electromagnetic field that are used in the study of electromagnetism, one of the four fundamental interactions...

Digital physics is a speculative idea that the universe can be conceived of as a vast, digital computation device, or as the output of a deterministic...

Elastic energy is the mechanical potential energy stored in the configuration of a material or physical system as it is subjected to elastic deformation...

Suction is the day-to-day term for forces experienced by objects that are exposed to the movement of gases or liquids moving along a pressure gradient...

In mathematical physics, the concept of quantum spacetime is a generalization of the usual concept of spacetime in which some variables that ordinarily...

In physics, symmetry breaking is a phenomenon where a disordered but symmetric state collapses into an ordered, but less symmetric state. This collapse...

A particle-beam weapon uses a high-energy beam of atomic or subatomic particles to damage the target by disrupting its atomic and/or molecular structure...

Mechanics of planar particle motion is the analysis of the motion of particles gravitationally attracted to one another which are observed from non-inertial...

In physics, the von Neumann entropy, named after John von Neumann, is an extension of the concept of Gibbs entropy from classical statistical mechanics...

An X-ray laser can be created by several methods either in hot, dense plasmas or as a free-electron laser in an accelerator. This article describes the...

Cathodoluminescence is an optical and electromagnetic phenomenon in which electrons impacting on a luminescent material such as a phosphor, cause the emission...

46°15′04.8″N 6°01′12.5″E / 46.251333°N 6.020139°E / 46.251333; 6.020139 ALICE (A Large Ion Collider Experiment) is one of nine detector experiments...

Experiments directed toward developing fusion power are invariably done with dedicated machines which can be classified according to the principles they...