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In particle physics, the electron mass (symbol: me) is the mass of a stationary electron, also known as the invariant mass of the electron. It is one of the fundamental constants of physics. It has a value of about 9.109 × 10−31 kilograms or about 5.486 × 10−4 daltons, which has an energy-equivalent of about 8.187 × 10−14 joules or about 0.511 MeV.
Jun 25, 2018 · The mass at velocity $v = 0$ is called the rest mass and for an electron has a value of about $9.11 \times 10^{-31}$ kg. By now relativistic mass is not used anymore, because momentum is the more general concept. But a bound electron 'orbits' the atomic nucleus and has a certain velocity.
In physics, the electron mass or mass of an electron or electron rest mass is one of the fundamental constants and is defined as the mass of a stationary electron and denoted by m e. The value of electron mass is also known as the invariant mass of an electron.In this article, we will learn about the value and formula for the electron mass.
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The invariant mass, rest mass, intrinsic mass, proper mass, or in the case of bound systems simply mass, is the portion of the total mass of an object or system of objects that is independent of the overall motion of the system.
One of the key numbers we can extract from mass and momentum is the invariant mass, a number independent of the Lorentz frame we are in.
The invariant mass is proportional to the value of the total energy in one reference frame, the frame where the object as a whole is at rest (as defined below in terms of center of mass). This is why the invariant mass is the same as the rest mass for single particles.
Example \(\PageIndex{3}\): A non-null invariant for electromagnetic waves? The quantity \(Q^{-1} = \frac{1}{\vec{E}\cdot \vec{B}}\) is clearly an invariant, and it doesn’t vanish for an electromagnetic plane wave — in fact, it is infinite for a plane wave. Does this contradict our proof that any invariant must vanish for a plane wave?
