Muffler, which is commonly called silencer, is mainly a device which reduces the amount of noise made by a machine. It is mainly a part of the internal combustion engines. In fact the engine exhaust blows out through the muffler, thereby reducing the noise made by the combustion engine.

This particular device is installed along the exhaust pipe, as a part of the exhaust system of an internal combustion engine of a machine; and helps in reducing the exhaust noise. A muffler includes a resonating chamber which is specifically created to cause destructive interference, which helps the opposite sound waves to cancel out each other. The effects are mainly generated due to restriction, rather than due to cancellation.

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