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((Short description|Force applied in a chamber to remove a fluid))
((More citations needed|date=May 2020))
[[File:Positive Air Pressure.png|thumb|Fans or filters blow air into the system, creating a positive pressure. Excess air escapes passively through designed outlets.]]

'''Positive pressure''' is a pressure within a system that is greater than the environment that surrounds that system. Consequently, if there is any leak from the positively pressured system, it will egress into the surrounding environment. This is in contrast to a [[negative pressure room]], where air is sucked in.<ref>((Cite web|title=What's the Difference Between Positive and Negative Air Pressure Cleanrooms?|url=https://angstromtechnology.com/whats-the-difference-between-positive-and-negative-air-pressure-cleanrooms/|last=Angstrom-Tech-Admin|date=2016-04-20|website=Angstrom Technology|language=en-US|access-date=2020-05-01))</ref><ref name=":0">((Cite web|title=Negative and Positive Pressure Rooms 101 ((!)) Hospital Infection Control|url=https://airinnovations.com/negative-positive-pressure-rooms-hospital-infection-control/|date=2019-04-29|website=Air Innovations|language=en-US|access-date=2020-05-02))</ref>

Use is also made of positive pressure to ensure there is no ingress of the environment into a supposed closed system. A typical example of the use of positive pressure is the location of a habitat in an area where there may exist flammable gases such as those found on an [[oil platform]] or laboratory [[cleanroom]]. This kind of positive pressure is also used in [[operating theater]]s and [[In vitro fertilisation|''in vitro'' fertilisation]] (IVF) labs.((cn|date=June 2022))

Hospitals may have positive pressure rooms for patients with compromised [[immune system]]s. Air will flow out of the room instead of in, so that any airborne microorganisms (e.g., bacteria) that may infect the patient are kept away.<ref name=":0" />

This process is important in human and chick development. Positive pressure, created by the closure of anterior and posterior [[neuropore]]s of the [[neural tube]] during [[neurulation]], is a requirement of [[brain]] development.

[[Amphibian]]s use this process to [[Respiration (physiology)|respire]], whereby they use positive pressure to inflate their [[lung]]s.

== Historic utility ==

=== Industrial utility ===
Industrial use of positive pressure systems are commonly used to ventilate confined spaces with dust, fumes, pollutants and/or high temperatures <ref>Positive pressure technology for construction and industrial ventilation applications.

https://www.southern-tool.com/store/cms//142/b32e0_184-item.pdf

<br /></ref>

=== Clinical utility ===
Many hospitals are equipped with negative and positive pressure rooms just for the purposes described. [[Negative room pressure|Negative pressure rooms]] are used to help keep airborne pathogens (eg. aerosolized [[Coronavirus disease 2019|COVID-19]] and active [[Tuberculosis|TB]]) from escaping into surrounding areas, thereby preventing the spread of airborne pathogens to outside the room. Positive pressure rooms are used for [[immunocompromised]] persons (eg. [[Neutropenia|Neutropenic]]) whereby controlled quality air is sent into the room to prevent random (and potentially polluted) air from entering the room.<ref>((Cite journal|last=Rosenbaum|first=Robert A.|last2=Benyo|first2=Jeffrey S.|last3=O'Connor|first3=Robert E.|last4=Passarello|first4=Brent A.|last5=Williams|first5=Daniel R.|last6=Humphrey|first6=Brian D.|last7=Ross|first7=Robert W.|last8=Berry|first8=James M.|last9=Krebs|first9=Jeffrey G.|date=December 2004|title=Use of a portable forced air system to convert existing hospital space into a mass casualty isolation area|journal=Annals of Emergency Medicine|volume=44|issue=6|pages=628–634|doi=10.1016/j.annemergmed.2004.03.012|issn=1097-6760|pmc=7118873|pmid=15573039))</ref>

==See also==
* [[Filtered air positive pressure]]
* [[Pressure#Negative pressures|Negative pressure (disambiguation)]]
* [[Negative room pressure]]
* [[Overpressure (CBRN protection)]]
* [[Plenum chamber]]
* [[Positive pressure enclosure]]

== References ==
((Reflist))

((Authority control))

((DEFAULTSORT:Positive Pressure))
[[Category:Classical mechanics]]
[[Category:Gas technologies]]
[[Category:Pressure]]

[[sv:Övertryck (lufttryck)]]

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