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An oxygen mask is a mask that provides a method to transfer breathing oxygen gas from a storage tank to the lungs. Oxygen masks may cover only the nose and mouth (oral nasal mask) or the entire face (full-face mask). They may be made of plastic, silicone, or rubber . In certain circumstances, oxygen may be delivered via a nasal cannula instead ...
masks. Commedia dell'arte masks are a type of mask worn by performers of commedia dell'arte theatre. Masks are an integral part of the performance, and each character wears a particular mask design. Masks were originally all made of leather, but are now more commonly made of neoprene. They are an extension of the actors and their costumes, hair ...
Elastomeric respirator. Similar mask with generic flat disk filters. Elastomeric respirators, also called reusable air-purifying respirators, [1] seal to the face with elastomeric material, which may be a natural or synthetic rubber. They are generally reusable. Full-face versions of elastomeric respirators seal better and protect the eyes.
Probability theory. In probability theory and statistics, a normal distribution or Gaussian distribution is a type of continuous probability distribution for a real-valued random variable. The general form of its probability density function is. The parameter is the mean or expectation of the distribution (and also its median and mode ), while ...
The Hollow-Face illusion (also known as Hollow-Mask illusion) is an optical illusion in which the perception of a concave mask of a face appears as a normal convex face. While a convex face will appear to look in a single direction, and the gaze of a flat face, such as the Lord Kitchener Wants You poster, can appear to track a moving viewer, a ...
A typical industrial-grade gas mask for hazardous chemicals and dust A World War I British P Helmet c. 1915 Zelinsky–Kummant protivogaz, designed in 1915, was one of the first modern-type full-head protection gas masks with a detachable filter and eyelet glasses, shown here worn by U.S. Army soldier (USAWC photo) Indian muleteers and mule wearing gas masks, France, February 21, 1940 A Polish ...
A bifid nose (also known as cleft nose) is an uncommon congenital malformation which is characterized by the presence of a cleft between the two nostrils of the nose. [1] It is the result of a disturbance during embryological nose development. [2] It is part of the Tessier classification for craniofacial clefts. [3]
Facial prosthetic. A facial prosthetic or facial prosthesis is an artificial device used to change or adapt the outward appearance of a person's face or head. When used in the theater, film, or television industry, facial prosthetic makeup alters a person's normal face into something extraordinary. Facial prosthetics can be made from a wide ...