Henry's law constants at T = 293 2 K are reported for several halogenated ethanols and acetones, 3-pentanone, cyclopentanone, and 1,3-dioxane in water and for a larger number of alcohols, ketones. ethers and esters, benzene, pyridine. pentane, and cyclopentane in octane. The instrument and handling technique were validated by comparison with literature data for acetone, ethanol. and methanol from T = (273 2 to 303 2) K