Italians Natta (the inventor of the first catalyst for the production of isotactic propylene and among the fathers of macromolecular chemistry, for which he won the Nobel prize for chemistry along with Karl Ziegler), Evangelista Torricelli (inventor of the barometer), Alessandro Volta (inventor of the electric battery), Guglielmo Marconi (inventor of radio), Antonio Meucci (known for developing a voice-communication apparatus, often credited as the inventor of the first telephone before even Alexander Graham Bell), Galileo Ferraris (one of the pioneers of AC power system, invented the first induction motor), Ettore Majorana (who discovered the Majorana fermions), and Carlo Rubbia (1984 Nobel
Volta potential Volta potential The Volta potential (also called Volta potential difference, contact potential difference, outer potential difference, Δψ, or "delta psi") in electrochemistry, is the electrostatic potential difference between two metals (or one metal and one electrolyte) that are in contact and are in thermodynamic equilibrium. Specifically, it is the potential difference between a point close to the surface of the first metal, and a point close to the surface of the second metal (or electrolyte). The Volta potential is named after Alessandro Volta. When two metals are electrically isolated from each other, an arbitrary potential difference may exist between them.