elektronmassi

Elektronmassi refers to the mass of an electron. The electron is a fundamental subatomic particle, denoted by the symbol e⁻. It carries a negative elementary electric charge. The rest mass of an electron is approximately 9.109 × 10⁻³¹ kilograms. This mass is incredibly small compared to the mass of protons and neutrons, which make up the nucleus of an atom. In atomic mass units (amu), the electron mass is about 0.00054858 amu.

The electron mass is a fundamental constant in physics and plays a crucial role in atomic structure, chemical bonding, and electromagnetism. While the electron's mass is typically considered constant, relativistic effects can cause its effective mass to appear larger at speeds approaching the speed of light. However, in most everyday contexts and for non-relativistic calculations, the rest mass is the value used. The discovery and precise measurement of the electron mass by scientists like J.J. Thomson were pivotal in the development of atomic theory and our understanding of matter. The electron mass is a key parameter in many physics equations, including those describing atomic energy levels and the behavior of charged particles in electromagnetic fields.