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fusion, in physics. 1 The change of a substance from the solid to the liquid state, also known as melting. The heat given up by a unit mass of a substance during fusion is called the latent heat of fusion. See also melting point. 2 The combining of two light atomic nuclei to form a single heavier nucleus, with the release of energy. See nuclear energy; hydrogen bomb; cold fusion.

Process by which nuclear reactions between light elements form heavier ones, releasing huge amounts of energy. In 1939 Hans Bethe suggested that the energy output of the sun and other stars is a result of fusion reactions among hydrogen nuclei. In the early 1950s American scientists produced the hydrogen bomb by inducing fusion reactions in a mixture of the hydrogen isotopes deuterium and tritium, forming a heavier helium nucleus. Though fusion is common in the sun and other stars, it is difficult to produce artificially and is very difficult to control. If controlled nuclear fusion is achieved, it might provide an inexpensive energy source because the primary fuel, deuterium, can be extracted from ordinary water, and eight gallons of water could provide the energy equivalent to 2,500 gallons of gasoline.

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Fusion can refer to combining two or more distinct things


Computers and Software

  • AMD Fusion, a future next-generation microprocessor design
  • Compiz Fusion, a community maintained set of plugins for the Compiz Window Manager
  • Eyeon Fusion, a visual effects package
  • Fusion RTOS, an embedded or real-time operating system (RTOS)
  • Fusion WebPilot browser, an embedded web browser
  • IBRIX Fusion, a highly scalable parallel file system
  • Kega Fusion, a Sega multi-console emulator
  • Loop fusion, a compiler optimization which replaces multiple loops with a single one
  • Microcode Solutions Fusion, a popular Macintosh Emulator for Amiga computers
  • NetObjects Fusion, a web design program
  • Oracle Fusion Middleware, a portfolio of standards-based software products that spans multiple services
  • Sensor fusion, the combining of sensory data or data derived from sensory data from disparate sources
  • VMware Fusion, virtual machine software product by VMware, Inc.


Politics and organisations



  • Cleveland Fusion, a women's American football team in the NWFA
  • Miami Fusion, a professional soccer (football) club located in Fort Lauderdale

See also

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