Phase may refer to: Wikipedia does not have an article with this exact name. ... Wiktionary logo Wiktionary is a Wikimedia Foundation project intended to be a free wiki dictionary (including thesaurus and lexicon) in almost every language. ...
Phase (matter), a physically distinctive form of a substance, such as the solid, liquid, and gaseous states of ordinary matter
Phase (waves), the time position (or angle in the complex plane) within a cycle of a periodic waveform
Phase shifting or phasing, relative phase shift in superposing electromagnetic or acoustic waves; employed as an audio effect by musicians and DJs
Planetary phase, the appearance of the illuminated section of a planet
Polyphase system, a means of distributing alternating current electrical power in overlapping phases
Lunar phase, the appearance of the Moon as viewed from the Earth
"Phase technology", a branch of hyper-advanced science in some science fiction, which allows solid objects to pass through one another. Such properties that have explored the concept include comic book characters Shadowcat and the Vision, the Necrons in the Warhammer 40,000 science fiction game, the Tollan in Stargate SG-1, and experimented with unsuccessfully by Star Trek's United Federation of Planets and Romulan Star Empire. The term was also used in the science fiction thriller Hollow Man, but its effects more closely resembled invisibility, and did not include the ability to pass solid objects through one another.
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Liquid crystals are another phase intermediate between solids and liquids; the molecules of such a substance have an orderly orientation and in some cases (that is, for smectic liquid crystals) even an orderly position in one direction, but are free to flow past one another.
In contrast, in the plasma phase the atoms are dissociated, i.e.
These phases are of great interest to astrophysics, because these high-pressure conditions are believed to exist inside stars that have used up their nuclear fusion "fuel", such as white dwarves and neutron stars.
In astronomy, a lunar phase is any of the aspects or appearances presented by the Moon as seen from Earth, determined by the portion of the Moon that is visibly illuminated by the Sun.
The lunar phases vary cyclically as the Moon orbits the Earth, according to the relative positions of the Earth, the Moon, and the Sun.
The phases are not created by the shadow of the Earth on the Moon (that would be a lunar eclipse); instead, they are a result of our seeing only part of the illuminated half of the Moon.
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