The authors were able to achieve results similar to those obtained from a more expensive instrument by using a low-cost gas-solid adsorption apparatus. The apparatus was a glass manifold with known volumes which could be readily constructed. Gas adsorption has been studied for most of the last century and the simplest theories provide insight needed for most applications. We investigate two treatments-one attributed to Langmuir and one to Brunhau-er, Einmett, and Teller (BET)-and will apply their equations to our experimental data. A low-cost gas-solid adsorption apparatus was constructed and will be discussed. In addition a computer program designed using Microsoft Excel to calculate the adsorption isotherm while the experiment is taking place in the adsorption cell is presented.
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