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What (who) is plaque diffuser - definition
SPREADING OF SOUND ENERGY EVENLY IN A GIVEN ENVIRONMENT
Sound diffuser; Diffuser (acoustics)
Diffuser (optics)
![lomo]] effect.](https://commons.wikimedia.org/wiki/Special:FilePath/Verblühende Sauerkirsche.jpg?width=200 "lomo]] effect.")
.jpg?width=200 "A more formal diffuser filter over a camera flash, flanked by reflectors")
.jpg?width=200 "Flash diffuser to be mounted on a camera")
![[[Softbox]] diffuser; a larger area spreads the light more](https://commons.wikimedia.org/wiki/Special:FilePath/Elinchrom flash equipment DSCF2813.JPG?width=200 "[[Softbox]] diffuser; a larger area spreads the light more")
.jpg?width=200 "A lighting technician holds a reflector to diffuse the light falling on a politician")
![A home-made [[lightbox]], designed to produce images with diffuse lighting from all angles](https://commons.wikimedia.org/wiki/Special:FilePath/DIY Lightbox.jpg?width=200 "A home-made [[lightbox]], designed to produce images with diffuse lighting from all angles")
.jpg?width=200 "Lightbox photography")
![Both transmitting (softbox) and reflecting diffusors are used to light [[wagashi]] for a television program](https://commons.wikimedia.org/wiki/Special:FilePath/Wagashi Lighting for Japanese TV Program Recording.jpg?width=200 "Both transmitting (softbox) and reflecting diffusors are used to light [[wagashi]] for a television program")
![colour magazine]] or boomerang. Placed in front of a stage light, it gives quick changes in lighting gel, including a diffusion filter](https://commons.wikimedia.org/wiki/Special:FilePath/FSboomerang.JPG?width=200 "colour magazine]] or boomerang. Placed in front of a stage light, it gives quick changes in lighting gel, including a diffusion filter")
![[[Shōji]]](https://commons.wikimedia.org/wiki/Special:FilePath/障子に映る影Img568.jpg?width=200 "[[Shōji]]")
MATERIAL THAT DIFFUSES OR SCATTERS LIGHT, PRODUCING SOFT LIGHT
Diffusion filter; Diffusion gel; Diffuser (flash); Flash diffuser; Light guide plate
In optics, a diffuser (also called a light diffuser or optical diffuser) is any material that diffuses or scatters light in some manner to transmit soft light. Diffused light can be easily obtained by reflecting light from a white surface, while more compact diffusers may use translucent material, including ground glass, teflon, opal glass, and greyed glass.
Aroma lamp
![Aroma lamp with [[essential oil]]](https://commons.wikimedia.org/wiki/Special:FilePath/Aromatas.JPG?width=200 "Aroma lamp with [[essential oil]]")
APPLIANCE TO MIX ESSENTIAL OIL INTO AIR
Reed diffuser; Aromatherapy diffuser; Diffuser (aromatherapy)
Aroma lamps, or diffusers, are used to diffuse essential oils in aromatherapy and esoterics. They may project the oil into the air by heating it, letting it evaporate naturally, or nebulizing it using compressed air or ultrasonics.
Commemorative plaque
![This [[Greater London Council]] [[blue plaque]] at [[Alexandra Palace]] commemorates the launch of [[BBC Television]] there in 1936.](https://commons.wikimedia.org/wiki/Special:FilePath/Commemorative blue plaque - Alexandra Palace, world's first High-Definition Television Service.jpg?width=200 "This [[Greater London Council]] [[blue plaque]] at [[Alexandra Palace]] commemorates the launch of [[BBC Television]] there in 1936.")
![Canberra's]] first [[aerodrome]] and its first fatality in the 1920s.](https://commons.wikimedia.org/wiki/Special:FilePath/Dickson library plaque ACT.jpg?width=200 "Canberra's]] first [[aerodrome]] and its first fatality in the 1920s.")
![Sir [[Henry Cole]] helped set up the first historical marker scheme in 1866.](https://commons.wikimedia.org/wiki/Special:FilePath/Henry Cole, Lock & Whitfield woodburytype, 1876-84.jpg?width=200 "Sir [[Henry Cole]] helped set up the first historical marker scheme in 1866.")
![[[Löwenberger Land]] (Germany)](https://commons.wikimedia.org/wiki/Special:FilePath/Nassenheide-6 WT2005.jpg?width=200 "[[Löwenberger Land]] (Germany)")
![Beacon Hill]] in [[Boston, Massachusetts]].](https://commons.wikimedia.org/wiki/Special:FilePath/ParkmanHouse.jpg?width=200 "Beacon Hill]] in [[Boston, Massachusetts]].")
PLATE OR TABLET, FIXED TO A SURFACE OR FREESTANDING, COMMEMORATING AN EVENT, PERSON, PLACE, ETC.
Plaque (sign); Historical marker; Mural tablet; Wall tablet; Wall plaques; Memorial plaque; Historic marker; Historic Interest; Historical markers; Commemorative plaques; Inscription plaque; Inscription plate; Memorial Plaque; Historical Marker; State marker; Historic plaque; Historic plaques; Memorial plaques; State historical marker; Historical plaque; Comemmorative plaque
A commemorative plaque, or simply plaque, or in other places referred to as a historical marker, historic marker, or historic plaque, is a plate of metal, ceramic, stone, wood, or other material, typically attached to a wall, stone, or other vertical surface, and bearing text or an image in relief, or both, to commemorate one or more persons, an event, a former use of the place, or some other thing. Many modern plaques and markers are used to associate the location where the plaque or marker is installed with the person, event, or item commemorated as a place worthy of visit.
Wikipedia
Diffusion (acoustics)
Diffusion, in architectural acoustics, is the spreading of sound energy evenly in a given environment. A perfectly diffusive sound space is one in which the reverberation time is the same at any listening position. Most interior spaces are non-diffusive; the reverberation time is considerably different around the room. At low frequencies, they suffer from prominent resonances called room modes.
