The electron rest mass is the mass of an electron when it is at rest. It is a fundamental property of the electron, and is one of the reasons why it is such an important particle in electronics. The electron rest mass is very small, but it is not zero. This means that even when an electron is not moving, it still has a small amount of mass. This mass is what gives the electron its electrical charge.

### What is rest mass formula?

The rest mass formula is a mathematical formula used to calculate the rest mass of an object. The formula is:

m = E/c^2

where m is the rest mass of the object, E is its total energy, and c is the speed of light.

What is a rest mass? In physics, rest mass is the mass of an object when it is at rest. It is also known as intrinsic mass, invariant mass, or proper mass. The rest mass of an object is different from its mass in motion, which is called its relativistic mass. The rest mass is a measure of an object's inertial mass, which is the resistance of an object to being accelerated by a force. The concept of rest mass is also useful in determining the energy of an object at rest, which is called its rest energy. What is rest mass of an atom? The rest mass of an atom is the mass of the atom when it is at rest. The mass of an atom is the sum of the masses of the protons and neutrons in the nucleus, and the mass of the electrons orbiting the nucleus. Why is photon zero rest mass? A photon is a particle of light, and as such, it has no rest mass. The reason for this is that light is made up of electromagnetic waves, which do not have a rest mass. Instead, they have an energy, which is what gives them their mass. What is rest mass of proton? The rest mass of a proton is 1.67262 x 10-27 kg.