Phase
Encyclopedia
In physics
- Phase (matter)Phase (matter)In the physical sciences, a phase is a region of space , throughout which all physical properties of a material are essentially uniform. Examples of physical properties include density, index of refraction, and chemical composition...
, a physically distinctive form of a substance, such as the solid, liquid, and gaseous states of ordinary matter- Phase transitionPhase transitionA phase transition is the transformation of a thermodynamic system from one phase or state of matter to another.A phase of a thermodynamic system and the states of matter have uniform physical properties....
is the transformation of a thermodynamic system from one phase to another
- Phase transition
- Phase (separation science)
- Mobile phase and Stationary phase in chromatographyChromatographyChromatography is the collective term for a set of laboratory techniques for the separation of mixtures....
- Aqueous phase and organic phase in liquid-liquid extractionLiquid-liquid extractionLiquid–liquid extraction, also known as solvent extraction and partitioning, is a method to separate compounds based on their relative solubilities in two different immiscible liquids, usually water and an organic solvent. It is an extraction of a substance from one liquid phase into another liquid...
- Mobile phase and Stationary phase in chromatography
- Phase (waves)Phase (waves)Phase in waves is the fraction of a wave cycle which has elapsed relative to an arbitrary point.-Formula:The phase of an oscillation or wave refers to a sinusoidal function such as the following:...
, the initial angle of a sinusoidal function at its origin - Polyphase systemPolyphase systemA polyphase system is a means of distributing alternating current electrical power. Polyphase systems have three or more energized electrical conductors carrying alternating currents with a definite time offset between the voltage waves in each conductor. Polyphase systems are particularly useful...
, a means of distributing alternating current electric power in multiple conducting wires with definite phase offsets- Single-phase electric powerSingle-phase electric powerIn electrical engineering, single-phase electric power refers to the distribution of alternating current electric power using a system in which all the voltages of the supply vary in unison. Single-phase distribution is used when loads are mostly lighting and heating, with few large electric motors...
- Three-phase electric powerThree-phase electric powerThree-phase electric power is a common method of alternating-current electric power generation, transmission, and distribution. It is a type of polyphase system and is the most common method used by grids worldwide to transfer power. It is also used to power large motors and other heavy loads...
- Three-phaseThree-phaseIn electrical engineering, three-phase electric power systems have at least three conductors carrying voltage waveforms that are radians offset in time...
, the mathematics of three-phase electric power
- Three-phase
- Single-phase electric power
- Phase problemPhase problemIn physics the phase problem is the name given to the problem of loss of information concerning the phase that can occur when making a physical measurement. The name itself comes from the field of x-ray crystallography, where the phase problem has to be solved for the determination of a structure...
, the loss of information (the phase) from a physical measurement - Phase factorPhase factorFor any complex number written in polar form , the phase factor is the exponential part, i.e. eiθ. As such, the term "phase factor" is similar to the term phasor, although the former term is more common in quantum mechanics. This phase factor is itself a complex number of absolute value 1...
, a complex scalar used in quantum mechanics - Continuous Fourier transformContinuous Fourier transformThe Fourier transform is a mathematical operation that decomposes a function into its constituent frequencies, known as a frequency spectrum. For instance, the transform of a musical chord made up of pure notes is a mathematical representation of the amplitudes of the individual notes that make...
, the angle of a complex coefficient representing the phase of one sinusoidal component - Instantaneous phaseInstantaneous phaseThe notions of Instantaneous Phase and Instantaneous Frequency are important concepts in Signal Processing that occur in the context of the representation and analysis of time-varying signals....
, generalization for both cyclic and non-cyclic phenomena
In other sciences
- Archaeological phaseArchaeological phaseArchaeological phase and phasing refers to the logical reduction of contexts recorded during excavation to near contemporary archaeological horizons that represent a distinct "phase" of previous land use. These often but not always will be a representation of a former land surface or occupation...
, a discrete period of occupation at an archaeological site - Lunar phaseLunar phaseA lunar phase or phase of the moon is the appearance of the illuminated portion of the Moon as seen by an observer, usually on Earth. The lunar phases change cyclically as the Moon orbits the Earth, according to the changing relative positions of the Earth, Moon, and Sun...
, the appearance of the Moon as viewed from the Earth - Planetary phasePlanetary phasePlanetary phase is the term used to describe the appearance of the illuminated section of a planet. Like lunar phases, the planetary phase depends on the relative position of the sun, the planet and the observer....
, the appearance of the illuminated section of a planet - In biology, a part of the cell cycleCell cycleThe cell cycle, or cell-division cycle, is the series of events that takes place in a cell leading to its division and duplication . In cells without a nucleus , the cell cycle occurs via a process termed binary fission...
in which cells divide and reproduce - Color phase, in biology, a group of individuals within a species with a particular coloration
also very turn
In entertainment
- Phase (band)Phase (band)Phase is the leading act from Larissa Greece and was the first to have worldwide distribution in retailers such as iTunes from that particular region; they also made a digital single for Microsoft’s Playlist Seven program in Feb 2010 and they’ve shared the stage with Danny Cavanagh, Anneke van...
, an alternative rock band - "Phases" (Buffy episode), an episode of the TV series Buffy the Vampire Slayer
- Phases (.hack), fictional monsters in the .hack franchise
- Phase IVPhase IVPhase IV is an American science fiction film, made in 1974. It is the only feature-length film directed by the noted title designer Saul Bass. It starred Michael Murphy, Nigel Davenport and Lynne Frederick....
, a 1974 science fiction movie directed by Saul Bass - Phase, an incarnation of the DC Comics character usually known as Phantom GirlPhantom GirlPhantom Girl is a fictional comic book superhero who appears in books published by DC Comics. In the Post-Zero Hour continuity, she is known as Apparition, and is a member of the Legion of Super-Heroes in the 30th and 31st centuries...
Other uses
- Phase (syntax), a syntactic domain hypothesized by Noam Chomsky
- Phase 10Phase 10Phase 10 is a card game created in 1982 by Kenneth Johnson and currently produced by Fundex Games. Phase 10 is based on a variant of rummy known as Liverpool Rummy. It requires a special deck or two regular decks of cards; it can be played by two to six people...
, a card game created by Fundex Games - Phase (video game), a music game for the iPod developed by Harmonix Music Systems
- Phase (combat)Phase (combat)A Phase in combat is usually a period within a military operation of a longer duration that is a part of a serial chain of logically connected activities planned to culminate in a defined objective or goal....
usually a period of combat within a larger military operation - A musical composition using Steve Reich's phasingPhasingIn the compositional technique phasing, the same part is played on two musical instruments, in steady but not identical tempo...
technique
See also
- Phasing (disambiguation)Phasing (disambiguation)Phasing may refer to:*Phasing, a technique in musical composition* Phasing, the use of the Phaser , an audio signal processing technique*Phasing , a fictional or hypothetical ability to pass through solid objects*Marching band phasing...
- Faze (disambiguation)
- Phaser (disambiguation)
- Phasor (disambiguation)
- FASOR (disambiguation)