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 ...
Nuclear fission is the splitting (hence the term fission) of a heavy nucleus into two smaller nuclei. Typically involved is uranium-235 or plutonium-239. Nuclear fusion is tâ¦he combining (hence the term fusion) of two light nuclei into one larger nucleus. Typically involved is hydrogen-2 (deuterium) or hydrogen-3 (tritium).