Gas mask

A gas mask is a mask worn on the face to protect the body from airborne pollutants and toxic materials, and also known as a respirator. The mask may cover the eyes and other vulnerable soft tissues of the face, and will always form a sealed cover over the nose and mouth.

Filtration

A filter works by having holes that are smaller than the particles to be removed. As many pollutant molecules and particles are much bigger than air molecules (mostly O2 and N2) this works for many applications. This obviously lends itself to particulate hazards.

Related Topics:
Filter - O₂ - N₂

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However, the smaller the gap through which the air has to pass, the greater the pressure that must be exerted to draw the air through. As the user's lungs provide this pressure there is a limit as to how small these passages may be. Thus to extract many toxic gases, other methods must be used.

Related Topics:
Pressure - Lung

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