Pyotr Kapitsa

Pyotr Kapitsa
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Name	Pyotr Kapitsa
Caption	Pyotr Kapitsa on a 1994 Russian stamp
Birth date	08 July 1894
Birth place	Kronstadt, Russian Empire
Death date	08 April 1984
Death place	Moscow, Russian SFSR, Soviet Union
Fields	Physics
Workplaces	Trinity College, Cambridge, Cavendish Laboratory, Institute for Physical Problems
Alma mater	Petrograd Polytechnical Institute
Doctoral advisor	Abram Ioffe, Ernest Rutherford
Known for	Superfluidity, Liquid helium, High-magnetic field physics
Prizes	Nobel Prize in Physics (1978), Lomonosov Gold Medal (1959), Franklin Medal (1944), Faraday Medal (1942), Hero of Socialist Labour (1945, 1974)
Spouse	Anna Krylova
Children	Sergei Kapitsa, Andrei Kapitsa

Pyotr Kapitsa was a pioneering Soviet physicist and Nobel laureate renowned for his fundamental work in low-temperature physics and the discovery of superfluidity. His career was uniquely divided between the United Kingdom under the mentorship of Ernest Rutherford at the Cavendish Laboratory and a forced return to the Soviet Union, where he founded and directed the Institute for Physical Problems in Moscow. A brilliant experimentalist, Kapitsa made seminal contributions to the study of liquid helium and the generation of intense magnetic fields, while also demonstrating remarkable personal courage in his dealings with the Stalinist regime.

Early life and education

Pyotr Kapitsa was born in the naval fortress city of Kronstadt to a family of military engineers. He entered the Petrograd Polytechnical Institute in 1914, where he studied under the renowned physicist Abram Ioffe and began his research in electrical engineering and magnetism. His studies were interrupted by the Russian Civil War, during which he taught at the institute and suffered the tragic loss of his first wife and their two children to the Spanish flu epidemic. In 1921, Kapitsa was allowed to travel to England as part of a Soviet scientific mission, where he began working at the Cavendish Laboratory in Cambridge.

Career and research

At the Cavendish Laboratory, Kapitsa quickly impressed Ernest Rutherford with his experimental ingenuity, leading to a position as a Fellow of the Royal Society and director of the Royal Society Mond Laboratory. His early work focused on creating immensely powerful magnetic fields and studying the properties of alpha particles. In 1934, during a routine visit to the Soviet Union, his passport was confiscated by the NKVD on orders from Joseph Stalin, effectively detaining him. Despite this, Kapitsa negotiated the establishment of the Institute for Physical Problems, to which the equipment from his Cambridge laboratory was eventually shipped. He later made crucial contributions to Soviet wartime projects, including work on liquid oxygen production, but refused to work directly under Lavrentiy Beria on the nuclear weapon program.

Superfluidity and liquid helium

Kapitsa's most famous scientific achievement was his investigation into the bizarre properties of liquid helium. In 1937, building on earlier observations by John F. Allen and Don Misener, he conducted elegant experiments that demonstrated helium-II could flow without any viscosity, a phenomenon he named superfluidity. He published his landmark findings in the journal *Nature* in 1938. This discovery, for which he would later share the Nobel Prize in Physics with Arno Allan Penzias and Robert Woodrow Wilson, opened the new field of quantum hydrodynamics and provided profound insights into quantum mechanics on a macroscopic scale.

Later life and legacy

In his later decades, Kapitsa turned to new areas of research, including ball lightning and microwave generation, while also becoming a prominent, outspoken voice on scientific and social issues. He used his considerable prestige to advocate for other scientists, famously defending Lev Landau during his imprisonment and criticizing state interference in research. He hosted the popular television science program *Evident, but Incredible*, presented by his son Sergei Kapitsa. As a member of the Presidium of the Academy of Sciences of the USSR, he remained an influential but often independent figure until his death in Moscow.

Awards and honors

Kapitsa received numerous prestigious awards throughout his career. He was elected a Fellow of the Royal Society in 1929 and received the society's Faraday Medal in 1942. International recognition included the Franklin Medal from the Franklin Institute in 1944. The Soviet Union honored him twice as a Hero of Socialist Labour and awarded him the Lomonosov Gold Medal of the Academy of Sciences of the USSR. His crowning achievement was winning the Nobel Prize in Physics in 1978 for his basic inventions and discoveries in the area of low-temperature physics. He was also a member of the Pontifical Academy of Sciences.

Category:Soviet physicists Category:Nobel laureates in Physics Category:Members of the Pontifical Academy of Sciences