KaptayG. 2024. To the 150th anniversary of the masterpiece by J. W. Gibbs on the equilibrium of heterogeneous substances, which is based on the mechanical theory of heat published 160 years ago by R. Clausius and the concept of entropy introduced by him. Bányászati és Kohászati Lapok. 157, 4 (Dec. 2024), 2-12.