If this ratio is less than one then the reaction will die out; if it is greater than one it will grow uncontrolled (an atomic explosion). If controlled in a nuclear reactor, such a chain reaction can provide power for society’s benefit. a series of events so related to each other that each one initiates the next; a number of events triggered by the same initial event… See the full definition. chain reaction. Whatever value has been assigned to the constant variable cannot be changed during the course of the experiment since doing so will create an unfair test. Answer. a series of events so related to each other that each one initiates the next; a number of events triggered by the same initial event… See the full definition. To maintain a sustained controlled reaction, for every 2 or 3 neutrons released, only one must be allowed to strike another uranium nucleus. How to use chain reaction in a sentence. Fission and Chain Reactions. Controlled Nuclear Fission. The process may be controlled (nuclear power) or uncontrolled (nuclear weapons). Nuclear reactions are controlled by a neutron-absorbing material, such as graphite. Controlled and Uncontrolled Chain Reactions A neutron hits the This is referred to as a chain reaction. How to use chain reaction in a sentence. What is the difference between a controlled and uncontrolled reaction that has to do with nuclear stuff? Uncontrolled nuclear reaction synonyms, Uncontrolled nuclear reaction pronunciation, Uncontrolled nuclear reaction translation, English dictionary definition of Uncontrolled nuclear reaction. A chain reaction refers to a process in which neutrons released in fission produce an additional fission in at least one further nucleus. In an atomic bomb Uranium is used above a critical size to get an uncontrolled chain reaction by ensuring all the available fissile material undergoes fission in the minimum time possible. This process, called the chain of infection, can only occur when all six links in the chain are intact. This is a chain reaction. Radiation and Internal Energy. Chain reaction definition is - a series of events so related to each other that each one initiates the next. If more than one neutrons emitted in a particular fission cause further fissions then no.of fission increaces with time and reaction is very fast huge amount of energy is released as a violent explosion and reaction is called uncontrolled. noun. This nucleus in turn produces neutrons, and the process repeats. In an uncontrolled process, all the neutrons are allowed to induce a fission and the reaction continues exponentially. Chain Of Infection - Infection Prevention And Control Certain conditions must be met in order for a microbe or infectious disease to be spread from person to person. In a controlled interaction, 2 of the neutrons are absorbed and the other is allowed to induce another fission event.