Pronunciation: [fˈɪsa͡ɪl] (IPA) 
The word "fissile" is spelled with a double "s" after the letter "i" because the first "s" represents a voiced "z" sound, while the second "s" represents an unvoiced "s" sound. In IPA phonetic transcription, this word is written as /ˈfɪsaɪl/, with stress on the first syllable. "Fissile" is an adjective that refers to the ability of a substance to split or break apart under the influence of external forces, such as pressure or heat.
Fissile is an adjective that describes a material's ability to undergo nuclear fission. Nuclear fission is a process where the nucleus of an atom splits into smaller parts, releasing a large amount of energy. Fissile materials typically consist of certain isotopes, such as uranium-235 (^235U) or plutonium-239 (^239Pu), which are capable of sustaining a chain reaction.
Furthermore, fissile materials are characterized by their ability to undergo fission when bombarded by neutrons. These neutrons collide with the nucleus, resulting in instability and subsequent division into two or more smaller fragments. This process releases additional neutrons along with a significant amount of energy in the form of radiation.
Fissile materials are essential components in nuclear reactors and nuclear weapons. In reactors, their ability to sustain a self-sustaining chain reaction is harnessed to produce electricity through controlled fission. On the other hand, in nuclear weapons, the immense energy released during uncontrolled fission is utilized to create a destructive force.
The term "fissile" is often used in the context of nuclear safety and non-proliferation discussions. It entails the careful management and control of fissile materials, as their uncontrolled or unauthorized use can have severe consequences. Proper handling, disposal, and security of fissile materials are paramount to prevent any potential accidents, proliferation, or misuse.
Capable of being split-applied to rocks which, like clay-slate, can be split or divided in the direction of the grain or cleavage.
Etymological and pronouncing dictionary of the English language. By Stormonth, James, Phelp, P. H. Published 1874.
The word "fissile" comes from the Latin word "fissilis", which means "easily split or divided". It is derived from the verb "findere", meaning "to split" or "to cleave". The Latin adjective "fissilis" was formed by adding the suffix "-ilis" denoting "capability" or "adjective form". Over time, the term made its way into English, retaining its meaning of being able to be split or divided easily. In a scientific context, "fissile" specifically refers to materials capable of sustaining a nuclear chain reaction.
