Related Terms. Ratio of the density of a substance at 20Â°C or 68Â°F to the density of water at 4Â°C or 39.2Â°F.
Flare ... Fission. In nuclear physics, the splitting of the atomic nucleus of a heavy element, resulting in the emission of nuclear energy and possibly causing a chain reaction (with similar results) within a mass of the element.Fission, Nuclear ... is a splitting of something into two parts. ~ may refer to:*In physics, nuclear ~ is a process where a large atomic nucleus is split into two smaller particles.... and other physical processes. In popular culture ...
The Fission Process in the Nuclear Reactor. A neutron colliding with a 235 U nucleus causes it to split into two nuclei (fission fragments, typically one heavier and one lighter nucleus) and several free neutrons (fission neutrons).