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| the property of matter by which it retains its state of rest or its velocity along a straight line so long as it is not acted upon by an external force |
| a wave produced by the acceleration of an electric charge and propagated by the periodic variation of intensities |
| moderator (mŏd'ə-rā'tər) Pronunciation Key
A substance, such as graphite, water, or heavy water, placed in a nuclear reactor to slow neutrons down to speeds at which they are more likely to be captured by fissionable components of a fuel (such as uranium-235) and less likely to be absorbed by nonfissionable components of a fuel (such as uranium-238). Also called neutron moderator. See also slow neutron. |