For 10 points, name this man who names a shearing fluid instability and a contraction with Helmholtz, a statement of the second law of thermodynamics with Planck, and an absolute temperature scale by himself.
He is the first namesake of a phenomenon whose onset is classically associated with a Richardson number of less than one-fourth.  He derived a namesake set of equations relating the Seebeck and Peltier coefficients.  He is first namesake of a process in which a star heats and radiates due to gravitational contraction, a mechanism that led him to claim the Sun was less than a billion years old.  He is also first namesake of the axiom that there cannot be a perfect heat engine.  For 10 points, name this man who names a shearing fluid instability and a contraction with Helmholtz, a statement of the second law of thermodynamics with Planck, and an absolute temperature scale by himself.
He is the first namesake of a phenomenon whose onset is classically associated with a Richardson number of less than one-fourth.  
1st Baron {Kelvin} or William {Thomson}