A primary task of biophysics is to understand the physical character of these cooperative interactions that are essential to life. Gas Masks Breathing device designed to protect the wearer against harmful substances in the air. The typical gas mask consists of a tight-fitting facepiece that contains filters, an exhalation valve, and transparent eyepieces. It is held to the face by straps and can be worn in association with a protective hood. 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.
Charcoal absorbs and holds a fairly large volume of poisonous gases.
Gas masks are widely used by the world's armed forces. Although it is possible to design filtering devices that will neutralize almost any specific toxic substance in the air, it is impossible to combine in one mask protection against all toxic substances. Military gas masks are accordingly constructed with a view to counteracting those chemicals that are thought most likely to be used in wartime. Gas masks are effective only against those chemical-warfare agents that are dispersed as true gases and are injurious when breathed. Agents such as mustard gas that are dispersed in liquid form and attack the body through the skin surface necessitate the use of special protective clothing in addition to gas masks.