Births on June 21

Willem Hendrik Keesom

Born on June 21, 1876

Willem Hendrik Keesom, Dutch physicist and academic (d. 1956)

Willem Hendrik Keesom () (21 June 1876, Texel – 24 March 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 the 1913 Nobel Prize in Physics).

He also discovered the lambda point transition specific-heat maximum between Helium-I and Helium-II in 1930.In 1924 he became member of the Royal Netherlands Academy of Arts and Sciences. In 1966, the minor planet

9686 Keesom was named after him.

References

Willem Hendrik Keesom

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Events on 1876

2 Feb

Major League Baseball
The National League of Professional Baseball Clubs of Major League Baseball is formed.
10 Mar

Alexander Graham Bell
The first successful test of a telephone is made by Alexander Graham Bell.
22 Apr

MLB
The first game in the history of the National League was played at the Jefferson Street Grounds in Philadelphia. This game is often pointed to as the beginning of the MLB.
4 Jun

First Transcontinental Railroad
An express train called the Transcontinental Express arrives in San Francisco, via the First Transcontinental Railroad only 83 hours and 39 minutes after leaving New York City.
25 Nov

Battle of the Little Bighorn
American Indian Wars: In retaliation for the American defeat at the Battle of the Little Bighorn, United States Army troops sack the sleeping village of Cheyenne Chief Dull Knife at the headwaters of the Powder River.

Births on June 21

Willem Hendrik Keesom

Born on June 21, 1876

References

Choose Another Date

Events on 1876

Major League Baseball

Alexander Graham Bell

MLB

First Transcontinental Railroad

Battle of the Little Bighorn