Phase - AbsoluteAstronomy.com

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 transition
  Phase transition
  A 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 (separation science)
- Mobile phase and Stationary phase in chromatography
  Chromatography
  Chromatography is the collective term for a set of laboratory techniques for the separation of mixtures....
- Aqueous phase and organic phase in liquid-liquid extraction
  Liquid-liquid extraction
  Liquid–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...
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 system
Polyphase system
A 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 power
  Single-phase electric power
  In 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 power
  Three-phase electric power
  Three-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-phase
    Three-phase
    In 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
Phase problem
Phase problem
In 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 factor
Phase factor
For 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 transform
Continuous Fourier transform
The 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 phase
Instantaneous phase
The 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 phase
Archaeological phase
Archaeological 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 phase
Lunar phase
A 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 phase
Planetary phase
Planetary 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 cycle
Cell cycle
The 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 IV
Phase IV
Phase 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 Girl
Phantom Girl
Phantom 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 10
Phase 10
Phase 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 phasing
Phasing
In the compositional technique phasing, the same part is played on two musical instruments, in steady but not identical tempo...

technique

In physics

In other sciences

In entertainment

Other uses

See also