## Background

The electron is a stable particle and a key component of the atom. When at rest (not in motion), it has a definitive and constant mass, and this rest mass is used in many equations in physics. Mass can be thought of as stored energy, as it is related to energy through the law of mass-energy equivalence.

See also: Electron Energy

## Energy Wave Constants – Equivalent

The following is the representation of this fundamental physical constant expressed in energy wave theory. Using energy wave constants, its value was calculated and shown to match the known value in the Summary of Calculations table.

### Electron Rest Mass

The electron rest mass is derived from the Longitudinal Energy Equation where K=10 (ten wave centers) and mass is represented as energy without wave speed (c^{2}). Electron mass is calculated as in-waves and out-waves that create standing waves to the electron’s classical radius where the waves become traveling in form again.

**Calculated Value: **9.1094E-31

**Difference from CODATA:** 0.000%

**Calculated Units**: kg

The complete derivation of this constant is available in the Fundamental Physical Constants paper.

## Alternative Derivation

An alternative version after substituting for O_{e}.