Gas masks are widely used by the world’s armed forces. Charcoal absorbs and holds a fairly large volume of poisonous gases. The most common filters employ fibre screens (to strain out finely divided solid particles) and chemical compounds such as charcoal (to capture or chemically alter poisonous gases in the air). The filters, which can be replaced, clean the air but do not add oxygen to it (some masks are connected by a hose to a separate tank of oxygen). The filter elements in the cheeks of the mask remove contaminants from the air that is drawn through the mask by the wearer’s inhaling. It is held to the face by straps and can be worn in association with a protective hood. The typical gas mask consists of a tight-fitting facepiece that contains filters, an exhalation valve, and transparent eyepieces. Gas mask, breathing device designed to protect the wearer against harmful substances in the air. Public Domain See all videos for this article In this video, English schoolchildren practice putting on and breathing through gas masks.
With the growth of total warfare and the targeting of civilians by air forces during World War II, the gas mask became a familiar part of daily life during wartime. The gas mask became a part of modern warfare with the introduction of chemical weapons in World War I.
#Gas mask the sun origin how to
0 kommentar(er)
