Charles-Augustin de Coulomb (14 June 1736 – 23 August 1806) was a French engineer and physicist. Born on June 14, 1736 in Angoulême, France. He died in Paris on August 23, 1806. His main contributions include torsion scale experiments, Coulomb's law, Coulomb earth pressure theory, etc. At the same time, it is also known as the "ancestor of soil mechanics".
The electrostatic force constant is a physical constant that represents two point charges in a vacuum with a charge amount of 1c, and when they are 1m apart, the magnitude of the force acting between them is 8987551×10⁹n。It is also known as the Coulomb constant and is named after the physicist Coulomb. This constant is used to describe the electrostatic force between two point charges and is one of the very important constants in electrostatics and electromagnetism. In the calculation of capacitors, the electrostatic force constant is also very important.
The electrostatic force constant was measured by a torsion scale experiment, which was carried out by the French engineer and physicist Coulomb. Coulomb uses a torsion scale device to suspend an insulating rod with a charged metal ball at one end of the insulating rod and another charged metal ball approached to accurately measure the magnitude of the electrostatic force according to the torsion angle. Thus, the electrostatic force constant is measured by Coulombs.