We use masks for celebrations, ceremonies, concerts etc. if you would like to know more about it please go to http://wiki.answers.com/
Simple. Just don't use it
this is used to protect the lower part of our face from chemicals. this is paired with laboratory goggles/glasses. answer by: Frances Mercado :)
The sorting out of the three beams so that they produce images of only the intended primary colour is performed by a thin steel mask that lies directly behind the phosphor screen. This mask contains...
A safety mask is used to prevent dirt and fumes, contamination etc from entering the body.