Paul Langevin, physicien fran ais de renom, nous livre ses recherches sur les gaz ionis s. Un incontournable de la physique exp rimentale du d but du XXe si cle. This work has been selected by scholars as being culturally important, and is part of the knowledge base of civilization as we know it. This work is in the "public domain in the United States of America, and possibly other nations. Within the United States, you may freely copy...