Ehrenfest was a great physicist of the 20th century. He made particular contribution to appraising，comprehending and creating fundamental conception of the modern physics and acquired many achievements in theoretical physics. He built the Ehrenfest Urn model，completed the appraisable works about statistical physics，founded the adiabatic principle，advanced the conception of two level phase transition and formed his characteristic mode in scientific research. He had talkative abilities like Socrates also.By integrating all of those abilities with his humane characteristic，he had become worthy of the name of a great teacher finally.
Ehrenfest A Great Master of Modern Physics Quintessence(p. 78)