NationMaster - Encyclopedia: Filter (chemistry)

In chemistry and common usage, a filter is a device (usually a membrane or layer) that is designed to block certain objects or substances while 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 (derived from alchemy) is the science of matter at or near the atomic scale. ... Look up air in Wiktionary, the free dictionary. ... Water (from the Old English waeter; c. ... This power plant in New Mexico releases sulfur dioxide and particulate matter into the air. ... Coffee in beverage form Coffee is a beverage, served hot or with ice, prepared from the roasted seeds 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 (body modification) suspension bondage suspension (figure... In jewelry, a solid gold piece is the alternative to gold-filled or gold-plated jewelry. ... A liquid will assume the shape of its container. ...

See also

Filters for specific applications: A water filter is a device which removes impurities from water by means of a fine physical barrier and/or chemical processes. ... Air filter in an Opel Astra car, top side=clean side Air filter in an Opel Astra car, bottom side=dust side An air filter is a device which removes contaminants, often solid particles such as dust, pollen, mold, and bacteria from air. ... Many items requiring lubrication by petroleum products need this lubricant to be highly clean. ...

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. ...

Related devices and concepts: 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. ... 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 sand separator or hydrocyclone is a device which utilizes centrifugal force to separate sand or other heavy particles out of water. ... 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. ... Slow sand filter beds are used in water purification for treating raw water to produce a potable product. ...

Categories: Filters Activated carbon (also called activated charcoal) is the more general term which includes carbon material mostly derived from charcoal. ... Non-Filter or Non Filter is a category of air purification system created by Microgenix Technology Ltd. ... Belgian 1930s era L.702 model civilian mask A gas mask, is a mask worn on the face to protect the body from airborne pollutants and toxic materials. ... Sieve may mean: a colander, used in cooking goaltender, as taunted among crowds at American college ice hockey games In mathmatics, sieve theory, technique for counting or filtering sets of numbers sieve of Eratosthenes general number field sieve sieve (category theory), a way of writing down how objects in a... A typical metal colander A colander (sometimes spelt collander) is a type of sieve used in cooking for separating liquids and solids. ... The term reverse osmosis comes from the process of osmosis, the natural movement of solvent from an area of low solute concentration, through a membrane, to an area of high solute concentration if no external pressure is applied. ... Filter feeders (also known as suspension feeders) are animals that feed by straining suspended matter and food particles from water, typically by passing the water over a specialized structure, such as the baleen of baleen whales. ... A filter binding assay is a simple way to quickly study many samples. ...