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单词 poison
释义
poison
Physics

  • A substance that absorbs neutrons in a nuclear reactor and therefore slows down the reaction. It may be added intentionally for this purpose or may be formed as a fission product and need to be periodically removed.

Chemistry

  • 1. Any substance that is injurious to the health of a living organism.

    2. A substance that prevents the activity of a catalyst.

    3. A substance that absorbs neutrons in a nuclear reactor and therefore slows down the reaction. It may be added intentionally for this purpose or may be formed as a fission product and need to be periodically removed.

Chemical Engineering

  • 1. A chemical substance that results in the reduction in effectiveness of a catalyst as the result of it being contaminated by a reactant, a product of the reaction, or some other extraneous material. The poison accumulates on the surface of the catalyst, reducing the effectiveness by reducing active sites for the reaction to occur.

    2. Another name for a toxic substance.
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