Le Châtelier, Henri Louis, 1850-1936, French industrial chemist. He made many contributions to industrial chemistry, but is best known for his work on the structure of alloys and for his enunciation of Le Châtelier's principle. This fundamental contribution to chemical thermodynamics had been anticipated in part by J. W. Gibbs, whose work Le Châtelier helped to spread in France. Toward the end of his life he wrote on topics involving industrial efficiency and labor-management relations.

Merdes-le-Château is a Walloon municipality located in the Belgian province of Hainaut. On January 1, 2006 Merdes-le-Château had a total population of 4,093. The total area is 30.24 km² which gives a population density of 135 inhabitants per km².