Electron-volt (eV): A Fundamental Unit of Energy


Embark on a journey into the fundamental realm of energy measurement with the Electron-volt (eV). In this guide, we will explore what eV signifies, its significance in the world of physics, and its applications in understanding the energy of particles at the atomic and subatomic levels.

Defining Electron-volt (eV)

Electron-volt (eV) is a unit of energy used in physics and related fields. It represents the amount of kinetic energy gained or lost by a single electron when it moves through an electric potential difference of one volt.

Significance in Physics

The eV is particularly useful in describing energy at the atomic and subatomic scales. It provides a convenient and practical scale for expressing energies of particles in these realms.

Applications of Electron-volt (eV)

1. Atomic and Molecular Physics: eV is commonly used to describe the energy levels of electrons in atoms and molecules.

2. Semiconductor Physics: In semiconductor physics, eV is a common unit for expressing the energy levels of electrons in materials like silicon.


1 eV = 1.602 x 10-19 joules

1 eV = 96.485 kJ/mol (approx)


The Electron-volt serves as a crucial unit in understanding the energy landscape of particles at the atomic and subatomic levels. Its applications are diverse, ranging from fundamental physics to the design of advanced semiconductor devices.