We investigated the uptake of ethyl alcohol ( ethanol) vapor by sulfuric acid solutions over the range similar to 40 to similar to 80 wt % H2SO4 and temperatures of 193-273 K. Laboratory studies used a fast flow-tube reactor coupled to an electron-impact ionization mass spectrometer for detection of ethanol and reaction products. The uptake coefficients (gamma) were measured and found to vary from 0.019 to 0.072, depending upon the acid composition and temperature. At concentrations greater than similar to 70 wt % and in dilute solutions colder than 220 K, the gamma values approached similar to 0.07. We also determined the effective solubility constant of ethanol in similar to 40 wt % H2SO4 in the temperature range 203-223 K. The potential implications to the budget of ethanol in the global troposphere are briefly discussed.