Separation of what? If it is the separation of East/West Germany then it is because gas masks were used in Gas Warfare, which was used in WWI and WWII.
yes gas masks were used
There are several company's selling and inventing new gas masks.
yes you did they were called mick mouse gas masks they were for children
You don't put gas into gas masks. They are used to keep out poisonous gases.
Not all gas masks are compatible with helmets, so some soldiers forgo helmets to wear their masks.
yes they did!
The reason they wore gas masks is because they weren't sure weather the Nazi's would drop gas bombs as they did in WW1
They wore gas masks because it fit in with the theme of the video.
It was invented by Garrett A. Morgan in July 25, 1916.
They were called Gas Masks
Mechanical separation is any process that will separate compounds or elements that are found in a mixture. This commonly entails removal of particles of solid or liquid drops from a gas or a liquid.
how did gas masks change society? what