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| the ability of a substance to flow; a measure of this ability, the reciprocal of the coefficient of viscosity |
| radiation consisting of electromagnetic waves, including radio waves, infrared, visible light, ultraviolet, x-rays, and gamma rays |
artificial radioactivity n.
The radioactivity of isotopes that have been artificially produced through the bombardment of naturally occurring isotopes by subatomic particles or by high levels of x-rays or gamma rays. Also called induced radioactivity.