BET Surface Area Measurement by Krypton Adsorption Instead of Nitrogen Adsorption

In this video we show the measurement of BET Surface Area using krypton adsorption isotherm data. We show that for very low surface area materials nitrogen adsorption data becomes unreliable due to free-space correction errors. We then explore why krypton adsorption provides high quality isotherms when analysing low surface area materials and we compare nitrogen and krypton isotherms and BET Surface Area data for a low area sample.