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What scientific fields did William Thomson study besides thermodynamics?

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Kelvin, William Thomson, Baron — William Thomson, Baron Kelvin William Thomson, Baron Kelvin.

Beyond his foundational work in thermodynamics, William Thomson, Baron Kelvin, made significant contributions to several other scientific and engineering fields:

Electricity and Magnetism: He conducted extensive mathematical analysis of these forces, including developing key concepts for the electromagnetic theory of light.1
Mechanics and Hydrodynamics: Thomson performed fundamental research in mechanics and hydrodynamics, contributing to the 19th-century understanding of fluid motion.12
Geophysics: He applied his scientific principles to determine the age of the Earth.1
Engineering and Communication: His work in engineering was instrumental in the development of submarine telegraphy and the successful laying of the first transatlantic cable, which significantly advanced global communication.1

Thomson is widely recognized for his ability to synthesize these disparate areas of physics by viewing them through the lens of energy-related phenomena.1