Plenum may refer to: *

Plenum chamber A plenum chamber is a pressurised housing containing a fluid (typically air) at positive pressure. One of its functions is to equalise pressure for more even distribution, compensating for irregular supply or demand. It is typically relatively la ...

, a chamber intended to contain air, gas, or liquid at positive pressure * Plenism, or ''Horror vacui'' (physics) the concept that "nature abhors a vacuum" *

Plenum (meeting) A plenary session or plenum is a session of a conference which all members of all parties are to attend. Such a session may include a broad range of content, from keynotes to panel discussions, and is not necessarily related to a specific styl ...

, a meeting of a deliberative assembly in which all members are present; contrast with

quorum A quorum is the minimum number of members of a deliberative assembly (a body that uses parliamentary procedure, such as a legislature) necessary to conduct the business of that group. According to ''Robert's Rules of Order Newly Revised'', the ...

Plenum space A plenum space is a part of a building that can facilitate air circulation for heating and air conditioning systems, by providing pathways for either heated/conditioned or return airflows, usually at greater than atmospheric pressure. Space ...

, enclosed spaces (in buildings) used for airflow *

Plenum cable __NOTOC__ Plenum cable is electrical cable that is laid in the plenum spaces of buildings. In the United States, plastics used in the construction of plenum cable are regulated under the National Fire Protection Association standard NFPA 90A: Stan ...

, electrical wire permitted in plenum spaces per building codes *

Plenum Publishing Corporation Springer Science+Business Media, commonly known as Springer, is a German multinational publishing company of books, e-books and peer-reviewed journals in science, humanities, technical and medical (STM) publishing. Originally founded in 1842 in ...

, a publisher of scientific books and journals *

Plenum (physics) Luminiferous aether or ether ("luminiferous", meaning "light-bearing") was the postulated medium for the propagation of light. It was invoked to explain the ability of the apparently wave-based light to propagate through empty space (a vacuum), so ...

, a space completely filled with matter * Undergravel filters, in aquarium filtration, an open space under a layer of gravel or sand *

Air-mixing plenum In building services engineering and HVAC, an air-mixing plenum (or mixing box) is used for mixing air from different ductwork systems. Usage The most common application for an air-mixing plenum is the mixing of ''return air'' (or ''extract ai ...

, a place where ducts meet

See also