ABSTRACT
In the first half of the nineteenth century, the following scientists made significant contributions in the area of electricity concepts: J. Berzelius, T. Grotthuss, M. Faraday, J. Dalton, A. Avogadro, H. Davy, J. Gay-Lussac, H. Kopp, V. Regnault, H. Hess, and others. The most important line of that period is studying of physical properties, weight, and volume of substances, which provided convincing material for experimental substantiation of the atomic and, subsequently, molecular theory in the first decades of the nineteenth century.
