Positive pressure

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 ingress into the surrounding environment.

However, use is 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 gasses such as found on an oil platform.

Hospitals may have positive pressure rooms for patients with compromised immune systems. Air will flow out of the room instead of in, so that any airborne germs that may infect the patient are kept away.

Amphibians use this process to respire, whereby they use positive pressure to inflate their lungs.

ee also

*Negative pressure
*Plenum


Wikimedia Foundation. 2010.

Игры ⚽ Нужно сделать НИР?

Look at other dictionaries:

  • positive pressure — n pressure that is greater than atmospheric pressure <mechanical ventilation of the lungs using positive pressure> * * * pressure greater than that of the atmosphere …   Medical dictionary

  • positive pressure — teigiamasis slėgmačio slėgis statusas T sritis fizika atitikmenys: angl. overpressure; positive pressure; superatmospheric pressure vok. Überdruck, m; positiver Druck, m rus. сверхбарометрическое давление, n pranc. pression positive, f …   Fizikos terminų žodynas

  • Positive pressure ventilation — Intervention ICD 9 CM 93.90 93.91 Me …   Wikipedia

  • Positive pressure ventilation — The provision of oxygen under pressure by a mechanical respirator, a machine designed to improve the exchange of air between the lungs and the atmosphere. The device is basically designed for administering artificial respiration, especially for a …   Medical dictionary

  • positive pressure — noun : pressure of a gas in excess of atmospheric pressure or of an arbitrary standard inspiratory positive pressures of 5 to 15 cm H2O were employed Journal American Medical Association …   Useful english dictionary

  • intermittent positive pressure breathing — n enforced periodic inflation of the lungs by the intermittent application of an increase of pressure to a reservoir of air (as in a bag) supplying the lungs abbr. IPPB * * * (IPPB) the active inflation of the lungs during inhalation under… …   Medical dictionary

  • Filtered Air Positive Pressure — A filtered air positive pressure environment in laboratory animal science is a space that is under positive pressure with respect to the outside world. In this way, no germs that could affect the lab animals or that are a threat to the SPF status …   Wikipedia

  • positive-pressure ventilation — see noninvasive ventilation …   The new mediacal dictionary

  • Positive end-expiratory pressure — (PEEP) is the pressure in the lungs (alveolar pressure) above atmospheric pressure (the pressure outside of the body) that exists at the end of expiration.[1] The two types of PEEP are extrinsic PEEP (PEEP applied by a ventilator) and intrinsic… …   Wikipedia

  • Pressure controlled intermittent mandatory ventilation — (PC IMV) is any mode of mechanical ventilation with preset inspiratory pressure (Pressure Control) and inspiratory time (Ti). Spontaneous breaths (i.e., inspiration is patient triggered and patient cycled) can exist between mandatory breaths… …   Wikipedia

Share the article and excerpts

Direct link
Do a right-click on the link above
and select “Copy Link”