Determination of surface areas of solids (ca. 1 cm.2) by a manometric gas-adsorption method

Small surface areas, ca. 1 cm.2, have been measured by a manometric gas-adsorption technique with xenon and ethylene as adsorbates. A thermistor is used as the pressure-sensing device which, in the range 1–100 µ, is accurate to ±3%. The apparatus as described can be used for the determination of surface areas of 1–20 cm.2 to better than 10%.