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In physics, spacetime is a mathematical model that fuses the three dimensions of space and the one dimension of time into a single four-dimensional continuum...

Water vapor, water vapour or aqueous vapor is the gaseous phase of water. It is one state of water within the hydrosphere. Water vapor can be produced...

A non-Newtonian fluid is a fluid that does not follow Newton's law of viscosity, that is, it has variable viscosity dependent on stress. In particular...

A binary black hole (BBH), or black hole binary, is a system consisting of two black holes in close orbit around each other. Like black holes themselves...

In the physical sciences, an interface is the boundary between two spatial regions occupied by different matter, or by matter in different physical states...

A Crest point on a wave is the maximum value of upward displacement within a cycle. A crest is a point on a surface wave where the displacement of the...

Charles Christian Lauritsen (April 4, 1892 – April 13, 1968) was a Danish-American physicist. Lauritsen was born in Holstebro, Denmark and studied architecture...

Sound masking is the inclusion of generated sound (commonly, though inaccurately, referred to as "white noise" or "pink noise") into an environment to...

In physical cosmology, assuming that nature is described by a Grand Unified Theory, the grand unification epoch was the period in the evolution of the...

Étienne-Louis Malus (/ˈɛt.i.ɛn ˈluː.i məˈluːs/; French: [e.tjɛn.lwi ma.lys]; 23 July 1775 – 23 February 1812) was a French officer, engineer, physicist...

The (n-p) reaction, or (n,p) reaction, is an example of a nuclear reaction. It is the reaction which occurs when a neutron enters a nucleus and a proton...

A McLeod gauge is a scientific instrument used to measure very low pressures, down to 10−6 Torr (0.133 mPa). It was invented in 1874 by Herbert McLeod...

In orbital mechanics, a frozen orbit is an orbit for an artificial satellite in which perturbations have been minimized by careful selection of the orbital...

Aimé Auguste Cotton (9 October 1869 – 16 April 1951) was a French physicist known for his studies of the interaction of light with chiral molecules. In...

The transport of heat in solids involves both electrons and vibrations of the atoms (phonons). When the solid is perfectly ordered over hundreds of thousands...

The elevator paradox relates to a hydrometer placed on an "elevator" or vertical conveyor that, by moving to different elevations, changes the atmospheric...

In statistical mechanics, the Gibbs algorithm, introduced by J. Willard Gibbs in 1902, is a criterion for choosing a probability distribution for the statistical...

In physics, electron emission is the ejection of an electron from the surface of matter, or, in beta decay (β− decay), where a beta particle (a fast energetic...

Conventional superconductors are materials that display superconductivity as described by BCS theory or its extensions. This is in contrast to unconventional...

Rotational Brownian motion is the random change in the orientation of a polar molecule due to collisions with other molecules. It is an important element...