Willem Hendrik Keesom

Willem Hendrik Keesom was a Dutch physicist who, in 1926, invented a method to freeze liquid helium. He also developed the first mathematical description of dipole–dipole interactions in 1921. Thus, dipole–dipole interactions are also known as Keesom interactions. He was previously a student of Heike Kamerlingh Onnes, who had discovered superconductivity.

21 June 1876

Born on the same birth day (21 June): Anne Carson • Antonia Mesina • Başak Eraydın • Charles Momsen • Charles Thomas Jackson • Feodor Gladkov • Fiorella Mari • Giuseppe De Sanctis • Harry Schmidt (mathematician) • Håvard Nordtveit • John II, Duke of Schleswig-Holstein-Haderslev • Kazimierz Leski • Michael Gross (actor) • Norbert Brunner (bishop) • Ričardas Berankis • Tchan Fou-li • Tyronne Drakeford • Vladimir Simagin • William Edwin Self

Born in the same month (June 1876): Alexandre Tuffèri • Alfred Kroeber • Edward Anthony Spitzka • Isaac Heinemann • Nigel Gresley • Pascual Díaz y Barreto • William Carr (rower) • William Sealy Gosset