William Thomson

William Thomson, 1st Baron Kelvin, (26 June 1824 – 17 December 1907) was a Scots-Irish mathematical physicist and engineer. He was born in Belfast in 1824. At the University of Glasgow he did important work in the mathematical analysis of electricity and formed the first and second laws of thermodynamics.

The Right Honourable The Lord Kelvin
President of the Royal Society
In office 1890–1895
Preceded by	George Stokes
Succeeded by	Lord Lister
Personal details
Born	(1824-06-26)26 June 1824 Belfast, Ireland
Died	17 December 1907(1907-12-17) (aged 83) Largs, Ayrshire, Scotland, United Kingdom
Nationality	Scots-Irish
Spouse(s)	Margaret Crum (m. 1852; died 1870) Frances Blandy (m. 1874–1907)
Children	none
Residence	Belfast; Glasgow; Cambridge
Signature
Alma mater	Royal Belfast Academical Institution Glasgow University Peterhouse, Cambridge
Known for	Joule–Thomson effect Thomson effect (thermoelectric) Mirror galvanometer Siphon recorder Kelvin material Kelvin water dropper Kelvin wave Kelvin–Helmholtz instability Kelvin–Helmholtz mechanism Kelvin–Helmholtz luminosity Kelvin's minimum energy theorem Kelvin transform Absolute zero Kelvin's circulation theorem Stokes' Theorem Kelvin bridge Kelvin sensing Kelvin equation Kelvin-Varley divider Magnetoresistance Coining the term 'kinetic energy'
Awards	First Smith's Prize (1845) Royal Medal (1856) Keith Medal (1864) Matteucci Medal (1876) Albert Medal (1879) Copley Medal (1883) John Fritz Medal (1905)
Scientific career
Institutions	University of Glasgow
Academic advisors	William Hopkins
Notable students	William Edward Ayrton William Murray Morrison
Influences	Sadi Carnot Rudolf Clausius Julius von Mayer James Joule Humphry Davy
Influenced	Andrew Gray
It is believed the "PNP" in his signature stands for "Professor of Natural Philosophy". Kelvin also wrote under the pseudonym "P. Q. R."

Works

Kelvin did much to unify physics in its modern form. He also had a career as an electric telegraph engineer and inventor, which propelled him into the public eye and gave him wealth, fame and honour.

For his work on the transatlantic telegraph project he was knighted in 1866 by Queen Victoria, becoming Sir William Thomson. He was noted for his work on the mariner's compass. This had been rather unreliable owing to the iron in ships' hulls.

Absolute temperatures are stated in units of kelvin in his honour. The existence of a lower limit to temperature (absolute zero) was known before his work, but Lord Kelvin found its correct value as approximately −273.15 degree Celsius or −459.67 degree Fahrenheit.

He was made Lord Kelvin in 1892 in recognition of his achievements in thermodynamics, and of his opposition to Irish Home Rule. He became Baron Kelvin, of Largs in the County of Ayr.

He was the first British scientist to be elevated to the House of Lords. His title refers to the River Kelvin, which flows close by his laboratory at the University of Glasgow. Despite offers from several world-renowned universities, Lord Kelvin refused to leave Glasgow, remaining Professor of Natural Philosophy for over 50 years, until his eventual retirement. The Hunterian Museum at the University of Glasgow has a permanent exhibition on the work of Lord Kelvin.

Always active in industrial research and development, he was recruited around 1899 by George Eastman to serve as vice-chairman of the board of the British company Kodak Limited, affiliated with Eastman Kodak.