We have developed a thermogravimetric system (TG system) for condensable gas adsorption by modifying a standard thermogravimetric
analyzer Cahn TG 2121 and performed isotherm measurements of water vapor adsorption on Fuji Davison type RD silica gel and
ethanol vapor adsorption on Maxsorp II activated carbon. For the water vapor-silica gel data, our results compare favorably
with the data reported by the manufacturer and those obtained from a volumetric method. This confirms the reliability of our
TG system for adsorbents which do not swell significantly. In addition, our isotherm data also provide useful design information
for the development of adsorption chillers.