Phase or phases may refer to:
Science
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State of matter, or phase, one of the distinct forms in which matter can exist
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Phase (matter), a region of space throughout which all physical properties are essentially uniform
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Phase space
In dynamical system theory, a phase space is a space in which all possible states of a system are represented, with each possible state corresponding to one unique point in the phase space. For mechanical systems, the phase space usually ...
, a mathematical space in which each possible state of a physical system is represented by a point — this equilibrium point is also referred to as a "microscopic state"
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Phase space formulation, a formulation of quantum mechanics in phase space
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Phase (waves), the position of a point in time (an instant) on a waveform cycle
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Instantaneous phase, generalization for both cyclic and non-cyclic phenomena
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AC phase, the phase offset between alternating current electric power in multiple conducting wires
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Single-phase electric power
In electrical engineering, single-phase electric power (abbreviated 1φ) is 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 load ...
, distribution of AC electric power in a system where the voltages of the supply vary in unison
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Three-phase electric power, a common method of AC electric power generation, transmission, and distribution
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Phase problem, the loss of information (the phase) from a physical measurement
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Phase factor, a complex scalar used in quantum mechanics
*in
continuous Fourier transform, the angle of a complex coefficient representing the phase of one sinusoidal component
Other sciences
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Archaeological phase
In archaeology, a phase refers to the logical reduction of contexts recorded during excavation to nearly contemporary archaeological horizons that represent a distinct "phase" of previous land use. These often but not always will be a representat ...
, a discrete period of occupation at an archaeological site
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Color phase, in biology, a group of individuals within a species with a particular coloration
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Gametic phase, in genetics, the relationship between alleles at two chromosomal loci
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Lunar phase
Concerning the lunar month of ~29.53 days as viewed from Earth, the lunar phase or Moon phase is the shape of the Moon's directly sunlit portion, which can be expressed quantitatively using areas or angles, or described qualitatively using the t ...
, the appearance of the Moon as viewed from the Earth
*Planetary phase, the appearance of the illuminated section of a planet
*Phase separation, in physical chemistry, the separation of a liquid mixture into two immiscible liquids above and below a meniscus
*Phase (syntax), in linguistics, a cyclic domain (proposed by Noam Chomsky)
*In biology, a part of the cell cycle in which cells divide (mitosis) and/or reproduce (meiosis)
Music
*Phase (band), a Greek alternative rock band
*Phases (band), an indie pop American band, formerly known as JJAMZ
*Phase (album), ''Phase'' (album), a debut studio album by an English singer Jack Garratt
*Phases (The Who album), ''Phases'' (The Who album), a box set of albums by The Who
*Phases (I See Stars album), ''Phases'' (I See Stars album), 2015
*Phase (Mildlife album), ''Phase'' (Mildlife album), a 2017 album by Mildlife
*Phases (Angel Olsen album), ''Phases'' (Angel Olsen album), 2017
*"Phases", a song by English alternative rock band Keane from their 2019 album ''Cause and Effect (Keane album), Cause and Effect''
Other entertainment
*Phases (Buffy the Vampire Slayer), "Phases" (''Buffy the Vampire Slayer''), a 1998 episode of the TV series ''Buffy the Vampire Slayer''
*Phases (.hack), fictional monsters in the .hack franchise
*Phase, an incarnation of the DC Comics character usually known as Phantom Girl
Other uses
*Phase 10, a card game created by Fundex Games
*Phase (video game), ''Phase'' (video game), a 2007 music game for the iPod developed by Harmonix Music Systems
*Phase (combat), usually a period of combat within a larger military operation
*A musical composition using Steve Reich's phasing technique
See also
* Phase 1 (disambiguation)
* Phase 2 (disambiguation)
* Phase 3 (disambiguation)
* Phase 4 (disambiguation)
* Phase 5 (disambiguation)
* Phase space (disambiguation)
* Phaser (disambiguation)
* Phasing (disambiguation)
* Phasor (disambiguation)
* Phaze, a fictional world in Piers Anthony's ''Apprentice Adept'' series
* Faze (disambiguation)
* FASOR (disambiguation)
* Stage (disambiguation)
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