Positive pressure

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 <a href="/facts/Negative_pressure_room/9KCegIbQ">negative pressure room</a>, where air is sucked in.
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 <a href="/facts/Oil_platform/n1eKvqpy">oil platform</a> or laboratory <a href="/facts/Cleanroom/qa97Ff9p">cleanroom</a>. This kind of positive pressure is also used in <a href="/facts/Operating_theater/zydvRK06">operating theaters</a> and <a href="/facts/In_vitro_fertilisation/kQNMtaBu">in vitro fertilisation</a> (IVF) labs.
Hospitals may have positive pressure rooms for patients with compromised <a href="/facts/Immune_system/HRCTf1pb">immune systems</a>. 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.
This process is important in human and chick development. Positive pressure, created by the closure of anterior and posterior <a href="/facts/Neuropore/awsFwAGt">neuropores</a> of the <a href="/facts/Neural_tube/xv4a9Il7">neural tube</a> during <a href="/facts/Neurulation/awsFwAGt">neurulation</a>, is a requirement of <a href="/facts/Brain/EKla9NkJ">brain</a> development.
<a href="/facts/Amphibian/r2BleD2W">Amphibians</a> use this process to <a href="/facts/Respiration_(physiology)/KKWAJIbd">respire</a>, whereby they use positive pressure to inflate their <a href="/facts/Lung/gTWXI6Fj">lungs</a>.

Positive pressure open-in-new

Positive pressure