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• Filter (chemistry) — a device to separate mixtures
• Electrostatic Dust Filter
• Filter (mathematics) — a certain kind of subset of a partially ordered set
• Filter program — in Unix, any program with standard I/O streams.
• Any software that processes a data stream (e.g. mail filter, printer filter , Internet filter)
• Filter (signal processing) — a device or algorithm for signal processing (e.g. audio filter)
• Filter (optics)An optical filter is a device which selectively transmits light having certain properties (often, a particular range of wavelengths, i. colours of light, or polarizations), while blocking the remainder. They are commonly used in photography, in many optic and filter (photography)In photography, a filter is a camera accessory consisting of an optical filter that can be inserted in the optical path. The filter can be a square optical glass mounted on a holder accessory; or (more commonly) a glass or plastic disk with a metal or pla (e.g. infrared filterAn infrared filter is a filter to remove visible light and only pass infrared light in different wavelenghts. These are mainly used in infrared photography. Filter products The Kodak Wratten 87, 87A, 87B, 87C Inexpensive gelatine filter. 87A and 87B are n, ND filter , UV filter ) — a device that blocks certain wavelength ranges of light
• Filter (band)Filter is an industrial rock band that gained some mainstream acceptance in the 1990s, along with similar artists like Garbage and Marilyn Manson. Richard Patrick and Brian Liesegang formed the band in 1993, releasing Short Bus in 1995. The album was a hi — a 1990sCenturies: 19th century 20th century 21st century Decades: 1940s 1950s 1960s 1970s 1980s 1990s 2000s 2010s 2020s 2030s 2040s Years: Events and trends Computers, technology Explosive growth of the Internet; decrease in the cost of computers and other techn industrial rock band
• Filter (water)A filter is a device which removes impurities from water by means of physical barrier. Filters are used to treat water for irrigation, drinking water, aquariums, and swimming pools. Examples Media filter Screen filter Disk filter Reverse osmosis See also — a device to physically separate impurities from water
• Filter (part) — a device that provides a physical barrier to unwanted impuries (e.g. oil filter, lint filter)
• Pneumatic filterA pneumatic filter is a device which removes contaminants from the compressed air stream. Typical commercial pneumatic filters will remove particles as small as 5 micrometres from the air. The filters protect pneumatic devices from damage that would be ca — a device to filter air

See also

• List of filter terms