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A laser is a device that emits light through a process of optical amplification based on the stimulated emission of electromagnetic radiation. The word...

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...

In spectroscopy, a forbidden mechanism (forbidden transition or forbidden line) is a spectral line associated with absorption or emission of photons by...

In general relativity, a vacuum solution is a Lorentzian manifold whose Einstein tensor vanishes identically. According to the Einstein field equation...

In observational astronomy, phase angle is the angle between the light incident onto an observed object and the light reflected from the object. In the...

Standard cubic feet per minute (SCFM) is the molar flow rate of a gas expressed as a volumetric flow at a "standardized" temperature and pressure thus...

Spectral signature is the variation of reflectance or emittance of a material with respect to wavelengths (i.e., reflectance/emittance as a function of...

The skull crucible process was developed at the Lebedev Physical Institute in Moscow to manufacture cubic zirconia. It was invented to solve the problem...

In chemistry, the electrochemical equivalent (Eq or Z) of a chemical element is the mass of that element (in grams) transported by a specific quantity...

A prognostic variable in engineering within the context of prognostics, is a measured or estimated variable that is correlated with the health condition...

In magnetohydrodynamics, the induction equation is a partial differential equation that relates the magnetic field and velocity of an electrically conductive...

A jar was an early unit of capacitance once used by the British Royal Navy. The term originated as the capacitance of a Leyden jar. Its value is such that...

VTPR (short for Volume-Translated Peng–Robinson) is an estimation method for the calculation of phase equilibria of mixtures of chemical components. The...

This article lists the main historical events in the history of condensed matter physics. This branch of physics focuses on understanding and studying...

This is a list of spurious inventions, technologies which are generally considered to not possess their claimed capabilities, to be hoaxes, or to not have...