An explosive nuclear chain reaction occurs when a sufficient quantity of nuclear fuel, such as uranium or plutonium, is brought together to form a critical mass. This is the minimum amount of fissionable material needed to start a chain reaction. The chain reaction starts when neutrons strike the heavy uranium or plutonium nucleus which splits releasing a tremendous amount of energy along with two or more neutrons which, in turn split more nuclei, and so on. In this gun-type device, the critical mass is achieved when a uranium projectile which is sub-critical is fired through a gun barrel at a uranium target which is also sub-critical. The resulting uranium mass comprised of both projectile and target becomes critical and the chain reaction begins.
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Jun 9, Liberty Articles , Take Action. Gates, past CIA director and national defense secretary, as its national president. Perhaps there has never been a more high profile national president. His honors in the scouting program are just as impressive. Many years ago I served as a lay minister and received an unusual patron for counseling, a new move-in to whom I was to have ecclesiastical jurisdiction for a time.
These example sentences are selected automatically from various online news sources to reflect current usage of the word 'chubby. Send us feedback. See more words from the same year.
The chubby community is a subculture in the gay community. Chubbies or "chubs" are gay men who are overweight or obese. Although there is some overlap between the chubby community and the bear community , the chubby culture is its own distinct subculture and community. It is somewhat parallel to the fat admirer subculture which centers around Big Beautiful Women. The latter subculture is primarily heterosexual , and there is some overlap with the fat acceptance movement.