Phase

Phase or phases may refer to:

Science

 * State of matter, or phase, one of the distinct forms in which matter can exist
 * Phase (matter), a region of space throughout which all physical properties are essentially uniform
 * Phase space, 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"
 * Phase space formulation, a formulation of quantum mechanics in phase space
 * Phase (waves), the position of a point in time (an instant) on a waveform cycle
 * Instantaneous phase, generalization for both cyclic and non-cyclic phenomena
 * AC phase, the phase offset between alternating current electric power in multiple conducting wires
 * Single-phase electric power, distribution of AC electric power in a system where the voltages of the supply vary in unison
 * Three-phase electric power, a common method of AC electric power generation, transmission, and distribution
 * Phase problem, the loss of information (the phase) from a physical measurement
 * 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
 * The argument or angle of complex numbers is sometimes called the phase

Other sciences

 * Archaeological phase, a discrete period of occupation at an archaeological site
 * Color phase, in biology, a group of individuals within a species with a particular coloration


 * Gametic phase, in genetics, the relationship between alleles at two chromosomal loci
 * Lunar phase, 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 (Jack Garratt album), 2016
 * Phases (The Who album), a 1981 box set of albums by The Who
 * Phases (I See Stars album), 2015
 * Phase (Mildlife album), 2017
 * Phases (Angel Olsen album), 2017
 * "Phases", a song by English alternative rock band Keane from their 2019 album Cause and Effect

Other entertainment

 * "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), 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