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| the amount of a given fissionable material necessary to sustain a chain reaction at a constant rate |
| a device that produces a nearly parallel, monochromatic, coherent beam of light by exciting atoms to a higher energy level and causing them to radiate |
| Joule effect | |
| —n | |
| 1. | See Joule's law Also called: Joule heating the production of heat as the result of a current flowing through a conductor |
| 2. | an increase in length of certain ferromagnetic materials when longitudinally magnetized |
| [C20: named after James Prescott | |