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F > FISSION - Pg. 122

FISSION FISSION Fission is the process whereby the nucleus of a particular heavy element such as uranium 235 or plutonium 239 splits into (generally) two nuclei of lighter elements, with the release of sub- stantial amounts of energy. FIT (1) The ability of an item to physically interface or interconnect with or become an integral part of another item. (2) Fit is the gen- eral term used to signify the range of tightness or looseness that may result from the application of a specific combination of allow- ances and tolerances in the design of mating parts. FIXED EFFECT A common systematic (nonrandom) shift in a group of measurements due to a controlled level change of a treat- ment or condition. FLAMEOUT The extinguishment of the flame in a reaction engine. See Burnout. FLAME RETARDANT RESIN A resin compounded with certain chemicals to reduce or eliminate its tendency to burn. For polyeth- ylene and similar resins, chemicals such as antimony trioxide and chlorinated paraffin's are useful.