Centenary of Langmuir Isotherm

Irving Langmuir published a seminal paper, on the adsorption of gases at a constant temperature in 1918, which presented one of the most important isotherm equations available in post Langmuir era. Many other useful isotherm equations were suggested both before and after 1918. The 1918 equation was the first where a model for adsorption phenomenon was suggested. In this article, we present a reasonably coherent discussion on Langmuir and some other adsorption isotherms reported in literature focusing on their uses and applications as well as analysing the merits and demerits to commemorate the hundred years of Langmuir's pioneering contribution in surface chemistry.