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: Fission is the splitting of a large atom into two or more smaller ones. Fission reaction does not normally occur in nature. Critical mass of the substance and high-speed neutrons are required. It takes little energy to split an atom in a fission reaction. The energy released by fission is a million times greater than that released in chemical reactions, but lower than the energy released by nuclear fusion. Fission is used in nuclear power plants. Uranium is the primary fuel used in power plants. Nuclear Fusion: Fusion is the fusing of two or more lighter atoms into a larger one. Fusion occurs in stars, such as the sun. High density, high temperature environment is required. Extremely high energy is required to bring two or more protons close ...