In chemistry and common usage, a filter is device (usually a membrane or layer) that is designed to block certain objects or substances whilst letting others through. Filters are often used to remove harmful substances from air or water, for example to remove air pollution, to make water drinkable, to prepare coffee. In domestic food and drink preparation where bulk solids are removed from liquids, this is often called a strainer. Chemistry (in Greek: χημεία) is the science of matter and its interactions with energy and itself (see physics, biology). ... This is a disambiguation page — a navigational aid which lists other pages that might otherwise share the same title. ... Water (from the Old English word wæter) is a colourless, tasteless, and odourless substance that is essential to all known forms of life and is known also as the most universal solvent. ... This power plant in New Mexico releases sulfur dioxide and particulate matter into the air. ... Coffee beans and a cup of coffee Coffee as a drink, usually served hot, is prepared from the roasted seeds (beans) of the coffee plant. ...

Filtrate is the liquid produced after filtering a suspension of a solid in a liquid. Suspension may refer to: suspension (chemistry) suspension bridge suspension (music) suspension (vehicle) (system of shock absorbers and supports that connect a vehicle to its wheels) suspension (civil engineering) (system that connects a structure to its foundation, for example in earthquake protection) suspension (topology) Suspension is a form of punishment in... A solid is a state of matter, characterized by a definite volume and a definite shape (i. ... A liquid will assume the shape of its container. ...

See also

Filters for various substances:

• Filter (water)
• Filter (air)

Filters for specific applications: A filter is a device which removes impurities from water by means of physical barrier. ... An air filter is a device which cleans dirty air. ...

• Pneumatic filter
• Coffee filter
• Filter mask

Filters by various methods: A pneumatic filter is a device which removes contaminants from the compressed air stream. ... Categories: Stub ... A half face particulate mask is generally worn to protect the wearer from dust and paint fumes A filter mask or particulate mask is a protective mask which usually covers the mouth and nose only. ...

• Filter paper
• Media filter
• Screen filter
• Disk filter
• Sand separator
• Slow sand filter bed
• Electrostatic dust filter

Related devices and concepts: Filter paper is any of various grades of coarse unfinished paper which can be used to separate solids from a liquid in which they are suspended. ... A media filter is a type of filter utilizing a bed of sand, crushed granite or other material to filter water for drinking, swimming pools, aquaculture, irrigation, and other applications. ... A screen filter is a type of filter utilizing a rigid or flexible screen to separate sand and other fine particles out of water for irrigation or other applications. ... A disk filter is a type of water filter similar to a screen filter, except that the filter cartridge is made of a number of disks stacked on top of each other like a pile of poker chips. ... A sand separator or hydrocyclone is a device which utilizes centrifugal force to separate sand or other heavy particles out of water. ... Slow sand filter beds are used in water purification for treating raw water to produce a potable product. ...

• Activated carbon
• Non-Filter (trade name).
• Gas mask
• Sieve
• Colander
• Reverse osmosis
• Filter feeder
• Filter binding assay