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An air purifier or air cleaner is a device which removes contaminants from the air in a room to improve indoor air quality. These devices are commonly marketed as being beneficial to allergy sufferers and asthmatics , and at reducing or eliminating second-hand tobacco smoke .
User's guide for a Dulcitone keyboard. A user guide, also commonly known as a user manual, is intended to assist users in using a particular product, service or application. It is usually written by a technician, product developer, or a company's customer service staff. Most user guides contain both a written guide and associated images.
In environmental philosophy, ecological self is central to the school of Experiential Deep Ecology, which, based on the work of Norwegian philosopher Arne Næss, argues that through the process of self-actualisation, one transcends the notions of the individuated "egoic" self and arrives at a position of an ecological self.
The word "manual" is used instead of the word "keyboard" when referring to any hand-operated keyboard on a keyboard instrument that has a pedalboard (a keyboard on which notes are played with the feet), such as an organ; or when referring to one of the keyboards on an instrument that has more than one hand-operated keyboard, such as a two- or ...