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| the property of a fluid that resists the force tending to cause the fluid to flow; the measure of the extent to which a fluid possesses this property |
| the time required for one half the atoms of a given amount of a radioactive substance to disintegrate |
| lambda particle
An electrically neutral baryon having a mass 2,183 times that of the electron and a mean lifetime of approximately 2.6 × 10-10 seconds. See Table at subatomic particle. |