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): Adam Zagajewski • Alexandra Obolentseva • Byron Schammer • Craig Lowndes • Eddie Lopat • Enoch Poor • Françoise Sagan • Gaël Kakuta • Gerald Kaufman • Hans Gerschwiler • Luis Antonio Tagle • Michael M. Richter • Mike McCormack (American football) • Min (South Korean singer) • Nikolaus Nilles • Nils Lofgren • O. C. Smith • Paolo Tornaghi • Paweł Bryliński • Tyronne Drakeford • Viktor Tsoi • William Dobinson Halliburton • William Frankena • Ya'acov Ben-Dov

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