# Coalescence

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**Coalesce**, **coalescence** or **coalescent** can refer to:

## Chemistry and physics

- [Coalescence (chemistry)](/source/Coalescence_(chemistry)), the process by which two or more separate masses of miscible substances seem to "pull" each other together should they make the slightest contact
- [Coalescence (physics)](/source/Coalescence_(physics)), the merging of two or more droplets, bubbles or particles into one
- [Coalescer](/source/Coalescer), device which induces coalescence in a medium

## Computer science

- [Coalescence (computer science)](/source/Coalescence_(computer_science)), the act of merging adjacent free blocks of memory to fill gaps caused by memory deallocation
- [COALESCE](/source/COALESCE), an SQL function that selects the first non-null from a range of values
- [Null coalescing operator](/source/Null_coalescing_operator), a binary operator that is part of the syntax for a basic conditional expression in several programming languages
- [Coalesced hashing](/source/Coalesced_hashing), a strategy of hash collision resolution in computing
- [Interrupt coalescing](/source/Interrupt_coalescing), a technique where events which would normally trigger a hardware interrupt are held back until either a certain amount of work is pending or a timeout timer triggers
- [Timer coalescing](/source/Timer_coalescing), an energy-saving technique for processors

## Other fields of science

- [Coalescence (genetics)](/source/Coalescence_(genetics)) or the coalescent theory, the merging of genetic lineages backwards to a most recent common ancestor, in other words a model of how alleles sampled from a population may have originated from a common ancestor
- [Coalescence (linguistics)](/source/Coalescence_(linguistics)), also known as fusion (phonetics) or vowel coalescence, a sound change where two or more phonological segments with distinctive features merge into a single segment
- In geography, the process by which urban sprawl produces a linear [conurbation](/source/Conurbation)
- [Microvoid coalescence](/source/Microvoid_coalescence) (materials science), a high energy microscopic fracture mechanism observed in the majority of metallic alloys and in some engineering plastics

## Popular culture

- [Coalesce (band)](/source/Coalesce_(band)), a metalcore band from Kansas City, Missouri, active from 1994 to 1999, 2005– - [Coalesce discography](/source/Coalesce_discography), a list of Coalesce's albums and songs - *[Coalesce / Boysetsfire](/source/Coalesce_/_Boysetsfire)*, a split music album released in 2000, by the bands Boysetsfire and Coalesce covering each other
- [*Coalescence* (Whit Dickey album)](/source/Coalescence_(Whit_Dickey_album)), a 2004 jazz album
- [*Coalescence* (Andre Canniere album)](/source/Coalescence_(Andre_Canniere_album)), a 2013 jazz album
- *[Coalescent](/source/Coalescent)*, a 2003 science-fiction novel
- [*Coalescence* (song)](/source/Coalescence_(song)), a song by Chris Christodoulou for the 2013 game Risk of Rain

## See also

- [Coalition](/source/Coalition), when people temporarily work together to achieve a common goal
- [Coalesse](/source/Coalesse), a U.S. based furniture company
- [Mind coalescence](/source/Mind_coalescence), a term related to collective intelligence

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Adapted from the Wikipedia article [Coalescence](https://en.wikipedia.org/wiki/Coalescence) by Wikipedia contributors ([contributor history](https://en.wikipedia.org/wiki/Coalescence?action=history)). Available under [Creative Commons Attribution-ShareAlike 4.0 International](https://creativecommons.org/licenses/by-sa/4.0/). Changes may have been made.