2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/18711A formula for potential U of the He-4--He-4 interaction in the liquid state is obtained by the direct electromagnetic computation as a function of the interatomic distance R. The potential decreases exponentially at large R. The further development and application of the result are discussed.4 pages, Latex 2eStatistical Mechanicstext