In a general mechanical and engineering sense, a reducer refers to any device, component, or substance designed to decrease size, dimension, speed, weight, or intensity. In piping systems, it specifically denotes a fitting that reduces pipe diameter. In chemistry, a reducing agent is a substance that donates electrons in a reduction-oxidation reaction. In mechanical power transmission, a gear reducer lowers rotational output speed while multiplying torque. The exact meaning always depends on the technical context in which the term is applied.
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