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The mask - a flimsy polymer cup - fits tightly around the face and is capable of filtering 95% of airborne particles, such as viruses, from the air.
The firsts masks were cloth placed around the mouths and noses of people and were not meant to be against contagion. It was to stop the smell as people thought that the stench caused disease. By protecting themselves from the smell, people thought they'd be protected from the disease.
During 1920, a plague broke out between a shared jurisdiction of China and Russia. The Chinese Imperial Court brought in a young doctor named Lien-teh Wu that determined that the plague was not spread by fleas but through the air. He expanded upon the surgery masks he'd seen in the West, and made it from gauze and cotton and added several layers of cloth to filter inhalations.
When the Spanish flu arrived in 1918, the mask was well-known among scientists and the public.
Instead of fiberglass, single-use respirators are made from melted polymer and air-blasted into layers of tiny fibers with bigger spaces between them.
As particles fly into this maze of fibers, they get stuck. An electrostatic charge is added to the material, so even smaller particles are pulled toward the fibers, while the big holes make it easy to breathe. The longer you wear an N95 respirator, the more efficient it becomes. But breathing becomes more difficult over time as the bigger holes get clogged up with particles.
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