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electron rest mass
The electron rest mass (symbol: ) is the mass of a stationary electron. It is one of the fundamental constants of physics, and is also very important in chemistry because of its relation to the Avogadro constant. It has a value of about kilograms or about atomic mass units, equivalent to an energy of about joules or about 0.511 megaelectronvolts.
== Terminology ==
The term "rest mass" + kinetic energy comes from the need to take account of the effects of special relativity on the apparent (or "observed") mass of an electron. It is impossible to "weigh" a stationary electron, and so all practical measurements must be carried out on moving electrons. The same is true with any other sub-atomic particle. For particles like photons or gluons the situation is even more problematic since the very concept of a stationary or "at rest" massless particle lacks meaning.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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