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In geometry, the major axis of an ellipse is its longest diameter: a line segment that runs through the center and both foci, with ends at the two most...

Dimensionless quantities, also known as quantities of dimension one are implicitly defined in a manner that prevents their aggregation into units of measurement...

A physical property is any property of a physical system that is measurable. The changes in the physical properties of a system can be used to describe...

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...

Dark-field microscopy (also called dark-ground microscopy) describes microscopy methods, in both light and electron microscopy, which exclude the unscattered...

The Cockcroft–Walton (CW) generator, or multiplier, is an electric circuit that generates a high DC voltage from a low-voltage AC or pulsing DC input....

In laser science, an output coupler (OC) is the component of an optical resonator that allows the extraction of a portion of the light from the laser's...

Even restricting the discussion to physics, scientists do not have a unique definition of what matter is. In the currently known particle physics, summarised...

The Fanning friction factor, named after John Thomas Fanning, is a dimensionless number used as a local parameter in continuum mechanics calculations....

The Otto Laporte Award (1972–2003) was an annual award by the American Physical Society (APS) to "recognize outstanding contributions to fluid dynamics"...

Numerical diffusion is a difficulty with computer simulations of continua (such as fluids) wherein the simulated medium exhibits a higher diffusivity than...

The Belgian Physical Society (BPS) (Dutch: Belgische Natuurkundige Vereniging and French: Société Belge de Physique) is the national physical society of...

In geometry, the semidiameter or semi-diameter of a set of points may be one half of its diameter; or, sometimes, one half of its extent along a particular...

A champagne flow is an astrophysical event whereby an HII region inside a molecular cloud expands outward until it reaches the interstellar medium. At...

A variable geometry turbomachine uses movable vanes to optimize its efficiency at different operating conditions. This article refers to movable vanes...