Physics (also physical chemistry).[ref]
https://www.cnrseditions.fr/auteur/jean-perrin/. Independent professional profile
Portrait of Jean Perrin
. Agence de presse Meurisse / Bibliothèque nationale de France; existing Commons crop. Commons PD-old/life-plus-70 claim in the country of origin, with a request for a separate US tag. No universal rights claim., via Wikimedia Commons. Source. New to topics? Read the docs here!
