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what is the si unit of thermal capacity
The SI unit of heat capacity is joule per kelvin
What is the kelvin unit
The kelvin is the base unit of temperature in the International System of Units (SI), having the unit symbol K.
Where did the kelvin unit get its name
It is named after the Belfast-born, Glasgow University engineer and physicist William Thomson, 1st Baron Kelvin.
who is william thomson, 1st baron kelvin
William Thomson, 1st Baron Kelvin, was an Irish-Scottish mathematical physicist and engineer, known for determining its correct value as approximately minus 273.15 degree Celsius or minus 459.67 degree Fahrenheit.

Question: did the mathematical physicist work closely with anyone
Self-contained rewrite: did william thomson work closely with anyone