An analog of a solution to an equation named for this scientist is illustrated by the Kac ring model. A limit named for Harold Grad and this scientist is used to derive an equation named for this scientist for hard sphere potentials. That equation named for this scientist is derived by assuming that the velocities of colliding particles are uncorrelated and independent of position. This scientist's use of the molecular chaos hypothesis led to criticism that irreversible dynamics should not be (10[1])derivable from time-symmetric dynamics. Loschmidt's paradox was formulated after (10[1])this (10[1])scientist published his H-theorem. (10[2])The logarithm of (10[1])the number of microstates is proportional (10[1])to entropy (-5[1])according to an equation engraved on this scientist's (10[1])gravestone. (10[1])For 10 points, name this Austrian physicist whose namesake constant is denoted k-sub-B. ■END■