RT Journal Article SR Electronic T1 On the equilibrium of heterogeneous substances JF American Journal of Science JO Am J Sci FD American Journal of Science SP 441 OP 458 DO 10.2475/ajs.s3-16.96.441 VO s3-16 IS 96 A1 J. W. Gibbs YR 1878 UL http://www.ajsonline.org/content/s3-16/96/441.abstract AB