Gas adsorption measurements are typically conducted using an adsorption isotherm, which plots the amount of gas adsorbed as a function of pressure at a constant temperature. The sample is first degassed to remove any pre-adsorbed molecules, and then exposed to a controlled environment of the adsorbate gas. The volume of gas adsorbed is measured at different pressures to generate the isotherm, which is then analyzed using appropriate models to extract surface and porosity information.
