A Moment of Science
Since the charcoal filter can’t absorb all chemicals, the last filter uses chemical reactions to clean the air. Say I’m breathing in chlorine-saturated air, like soldiers during World War I.
If you’ve ever seen movies about World War I, you know that the soldiers in the trenches often wore bulbous gas masks that made them look like human insects. The masks were necessary to protect them from chemical weapons such as chlorine gas, a noxious substance that could almost instantly suffocate unprotected victims.
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