He was the first and last X. He became the Professor in his 20s in the same institution, where he studied. He has a great name in the field of Science for his invaluable contributions.
What is his birth name? Also Give X
(X is a member of the lowest order of the British nobility, usually being referred to as ‘Lord’)

What is his birth name? Also Give X
(X is a member of the lowest order of the British nobility, usually being referred to as ‘Lord’)

Answer : William Thomson & X - Baron Kelvin