Electronvolt is equal to . It is a common unit of energy within physics, widely used in solid state, atomic, nuclear, and particle physics. It is commonly used with the metric prefixes milli-, kilo-, mega-, giga-, tera-, peta- or exa- (meV, keV, MeV, GeV, TeV, PeV and EeV respectively). In some older documents, and in the name Bevatron, the symbol BeV is used, which stands for billion (10) electronvolts; it is equivalent to the GeV. An electronvolt is the amount of energy gained (or lost) by the charge of a single electron moving across an electric potential difference of one volt.
EXA developed by Intel, using the Graphics Execution Manager. The Radeon free and open-source device driver supports 2D acceleration through EXA and Glamor. Glamor is supposed to obsolete all previous attempts. According to the X.Org web site "EXA" is an ""acceleration architecture with no well-defined acronym."" Dot.kde.org called it "Eyecandy Acceleration Architecture". The driver modification guide calls it "EXcellent Architecture or Ex-kaa aXeleration Architecture or whatever." EXA In computing, EXA is a graphics acceleration architecture of the X.Org Server (see also X Window System) designed to replace XAA (the XFree86 Acceleration Architecture) and to make the XRender extension more usable, with