WEBVTT - How do gun silencers work?

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<v Speaker 1>Hi Am Marshall Brain with today's question, how does a

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<v Speaker 1>gun silencer work? It's amazing that anything is able to

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<v Speaker 1>silence a gun, but gun silencers actually work on a

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<v Speaker 1>very simple principle. Imagine a balloon. If you pop a

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<v Speaker 1>balloon with a pin, it will make a loud noise.

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<v Speaker 1>But if you were to untie the end of the balloon,

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<v Speaker 1>I'll let the air out slowly, it makes very little noise.

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<v Speaker 1>This is the basic idea behind a gun silencer. To

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<v Speaker 1>fire a bullet from a gun, gun powder is ignited

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<v Speaker 1>behind the bullet. The gun powder creates a high pressure

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<v Speaker 1>pulse of hot gas. The pressure of the gas forces

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<v Speaker 1>the bullet down the barrel of the gun. When the

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<v Speaker 1>bullet exits the end of the barrel, it is like

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<v Speaker 1>uncorking a bottle. The pressure behind the bullet is immense, however,

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<v Speaker 1>on the order of three thousand pounds per square inch,

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<v Speaker 1>so the pop that a gun makes as it's uncorked

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<v Speaker 1>is extremely loud. A silencer screws onto the end of

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<v Speaker 1>the barrel and has a huge volume compared to the barrel,

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<v Speaker 1>twenty or thirty times greater. With the silencer in place,

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<v Speaker 1>the pressure rise gas behind the bullet has a big

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<v Speaker 1>space to expand into, so the pressure of the hot

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<v Speaker 1>gas falls significantly. When the bullet finally exits through the

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<v Speaker 1>hole in the silencer. The pressure being uncorked is much

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<v Speaker 1>much lower, perhaps sixty p s I. Therefore, the sound

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<v Speaker 1>of the gun firing is much softer. For moral this

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