Lars Onsager was a renowned Norwegian-American physical chemist and theoretical physicist known for his groundbreaking work in statistical mechanics. His most notable achievement was developing the reciprocal relations, which have had a profound impact on nonequilibrium thermodynamics. Onsager's theories provided a deeper understanding of the thermodynamic behavior of systems outside equilibrium, influencing many scientific disciplines. He was born in Norway in 1903 and later moved to the United States, where he conducted much of...