How a suppressor works is by dramatically reducing a gunshot noise by slowing the decompression of hot, high-pressure gasses. A firearm suppressor creates a controlled environment in which these gases expand and cool before they make contact with ambient air. Imagine untying a balloon instead of popping it, or slowly removing the champagne cork just enough for gas to vent in a slow and steady fashion: you would hear a hiss instead of a pop.
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