Willem Hendrik Keesom
Born	June 21, 1876 (1876-06-21) Texel
Died	March 24, 1956 (1956-03-25) Leiden
Nationality	Dutch
Fields	physics
Doctoral advisor	Heike Kamerlingh Onnes
Known for	helium

Willem Hendrik Keesom (June 21, 1876, Texel – March 24, 1956, Leiden) 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 (a feat for which Kamerlingh Onnes received a Nobel Prize).

[edit] See also

• Timeline of low-temperature technology

[edit] External links

• Albert van Helden, Willem Hendrik Keesom 1876 – 1956, In: K. van Berkel, A. van Helden and L. Palm ed., A History of Science in the Netherlands. Survey, Themes and Reference (Leiden: Brill, 1999) 498-500.
• Scientists of the Dutch School: Willem Hendrik Keesom @ Royal Netherlands Academy of Arts and Sciences.
• P.H. van Laer, Keesom, Wilhelmus Hendrikus (1876-1956), in Biografisch Woordenboek van Nederland.

This article about a physicist is a stub. You can help Wikipedia by expanding it. v • d • e

This article about a Dutch scientist is a stub. You can help Wikipedia by expanding it. v • d • e