Four adsorption isotherms at 278, 288, 293, and 303 K of butane, 2-methylpropane, and 1-butene are obtained on activated carbon. The results at pressures up to 0.8P/P(s) are measured on an automated apparatus and correlated by the vacancy solution model of Cochran and Danner [AIChE J. 1985, 31 (2), 268-277].