The vapor-liquid equilibrium behavior of tolan in alcohol was measured at atmospheric pressure in the dilute composition range of tolan with a recirculation still. Equilibrium compositions were determined with an ultraviolet spectrometer. The reliabilities of the compositions in the liquid and vapor seem to be +/- 2 x 10(-5) and +/- 2 x 10(-7) mole fraction of tolan, respectively. The accuracies of temperature and pressure are +/- 0.01 K and +/- 0.01 kPa, respectively. The volatilities K-i = y(i)/x(i) of tolan at infinite dilution were determined to be 0.0033, 0.0029, 0.0031, and 0.0054 in methanol, ethanol, 2-propanol, and 1-propanol, respectively.