Phase or phases may refer to:
Science
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State of matter
In physics, a state of matter is one of the distinct forms in which matter can exist. Four states of matter are observable in everyday life: solid, liquid, gas, and Plasma (physics), plasma.
Different states are distinguished by the ways the ...
, or phase, one of the distinct forms in which matter can exist
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Phase (matter)
In the physical sciences, a phase is a region of material that is chemically uniform, physically distinct, and (often) mechanically separable. In a system consisting of ice and water in a glass jar, the ice cubes are one phase, the water is a ...
, a region of space throughout which all physical properties are essentially uniform
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Phase space
The phase space of a physical system is the set of all possible physical states of the system when described by a given parameterization. Each possible state corresponds uniquely to a point in the phase space. For mechanical systems, the p ...
, a mathematical space in which each possible state of a physical system is represented by a point 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)
In physics and mathematics, the phase (symbol φ or ϕ) of a wave or other periodic function F of some real variable t (such as time) is an angle-like quantity representing the fraction of the cycle covered up to t. It is expressed in such a s ...
, the position of a point in time (an instant) on a waveform cycle
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Instantaneous phase
Instantaneous phase and frequency are important concepts in signal processing that occur in the context of the representation and analysis of time-varying functions. The instantaneous phase (also known as local phase or simply phase) of a ''compl ...
, 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 loads ...
, 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
Three-phase electric power (abbreviated 3ϕ) is a common type of alternating current (AC) used in electricity generation, transmission, and distribution. It is a type of polyphase system employing three wires (or four including an optional n ...
, a common method of AC electric power generation, transmission, and distribution
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Phase problem
In physics, the phase problem is the problem of loss of information concerning the phase that can occur when making a physical measurement. The name comes from the field of X-ray crystallography, where the phase problem has to be solved for the de ...
, 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
In mathematics, the Fourier transform (FT) is an integral transform that takes a function (mathematics), function as input then outputs another function that describes the extent to which various Frequency, frequencies are present in the origin ...
, the angle of a complex coefficient representing the phase of one sinusoidal component
*The argument or angle of
complex numbers
In mathematics, a complex number is an element of a number system that extends the real numbers with a specific element denoted , called the imaginary unit and satisfying the equation i^= -1; every complex number can be expressed in the form a ...
is sometimes called the phase
Other sciences
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Archaeological phase, 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
A haplotype (haploid genotype) is a group of alleles in an organism that are inherited together from a single parent.
Many organisms contain genetic material (DNA) which is inherited from two parents. Normally these organisms have their DNA orga ...
, in genetics, the relationship between alleles at two chromosomal loci
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Lunar phase
A lunar phase or Moon phase is the apparent shape of the Moon's directly sunlit portion as viewed from the Earth. Because the Moon is tidally locked with the Earth, the same hemisphere is always facing the Earth. In common usage, the four maj ...
, the appearance of the Moon as viewed from the Earth
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Planetary phase, the appearance of the illuminated section of a planet
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Phase separation
Phase separation is the creation of two distinct Phase (matter), phases from a single homogeneous mixture. The most common type of phase separation is between two immiscible liquids, such as oil and water. This type of phase separation is kn ...
, in physical chemistry, the separation of a liquid mixture into two immiscible liquids above and below a meniscus
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Phase (syntax)
In linguistics, the minimalist program is a major line of inquiry that has been developing inside generative grammar since the early 1990s, starting with a 1993 paper by Noam Chomsky.
Following Imre Lakatos's distinction, Chomsky presents minim ...
, in linguistics, a cyclic domain (proposed by Noam Chomsky)
*In biology, a part of the cell cycle in which cells divide (
mitosis
Mitosis () is a part of the cell cycle in eukaryote, eukaryotic cells in which replicated chromosomes are separated into two new Cell nucleus, nuclei. Cell division by mitosis is an equational division which gives rise to genetically identic ...
) or reproduce (
meiosis
Meiosis () is a special type of cell division of germ cells in sexually-reproducing organisms that produces the gametes, the sperm or egg cells. It involves two rounds of division that ultimately result in four cells, each with only one c ...
)
Music
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Phase music
Phase music is a form of music that uses phasing as a primary process music, compositional process. It is an approach to musical composition that is often associated with minimal music, as it shares similar characteristics, but some commentators ...
, a compositional process often associated with minimalism
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Phase (band)
Phase is a UK-based rock band formed in Larissa, Greece in 2003. It was founded by Thanos Grigoriou, who was performing and recording with various members until the line-up was completed in 2011, with the addition of Damos Harharidis and Vasil ...
, a Greek alternative rock band
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Phases (band)
Phases (formerly known as JJAMZ and pronounced ''juh-jamz'') is an American indie pop band from Los Angeles, California composed of Jason Boesel ( Rilo Kiley / Bright Eyes/ Conor Oberst and the Mystic Valley Band), Alex Greenwald (Phantom Pl ...
, an indie pop American band, formerly known as JJAMZ
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''Phase'' (Jack Garratt album), 2016
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''Phases'' (The Who album), a 1981 box set of albums by The Who
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''Phases'' (I See Stars album), 2015
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''Phase'' (Mildlife album), 2017
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''Phases'' (Angel Olsen album), 2017
*"Phases", a song by English alternative rock band Keane from their 2019 album ''
Cause and Effect''
*''
Piano Phase'', ''
Reed Phase
Reed or Reeds may refer to:
Science, technology, biology, and medicine
* Reed bird (disambiguation)
* Reed pen, writing implement in use since ancient times
* Reed (plant), one of several tall, grass-like wetland plants of the order Poales
* Re ...
'', ''
Violin Phase'' and ''Phase Patterns'' are musical compositions by Steve Reich
Other entertainment
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"Phases" (''Buffy the Vampire Slayer''), a 1998 episode of the TV series ''Buffy the Vampire Slayer''
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Phases (.hack), fictional monsters in the .hack franchise
*Phase, an incarnation of the DC Comics character
Phantom Girl
Phantom Girl (Tinya Wazzo) is a superhero appearing in books published by DC Comics, and is a member of the Legion of Super-Heroes in the 30th and 31st centuries. In post-'' Zero Hour'' continuity, she is known as Apparition. She has the power to ...
Other uses
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Phase 10, a card game created by Fundex Games
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''Phase'' (video game), a 2007 music game for the iPod developed by Harmonix Music Systems
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Phase (combat), usually a period of combat within a larger military operation
See also
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Phase 1 (disambiguation)
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Phase 2 (disambiguation)
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Phase 3 (disambiguation)
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Phase 4 (disambiguation) Phase 4, Phase IV or Phase Four may refer to:
Media
* Marvel Cinematic Universe: Phase Four, a group of superhero films and television series from 2021–2022
* Phase IV (1974 film), ''Phase IV'' (1974 film), a science-fiction horror film directe ...
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Phase 5 (disambiguation)
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Phase space (disambiguation)
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Phaser (disambiguation)
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Phasing (disambiguation)
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Phasor (disambiguation)
* Phaze, a fictional world in Piers Anthony's ''
Apprentice Adept'' series
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Faze (disambiguation)
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FASOR (disambiguation)
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Stage (disambiguation)
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