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The 8oWMtba of CO, CO,, H,, CH,OH, and H20 were measured In hexadwane, ocladecane, squalane, and benrophenom at 293-573 K and 1.013-90 bar d n g volume dkplacement and materlal balance technlqws. The experlmntal resub, coneWng of 280 dublUty data for 18 bbury mMures, were used to test the appIkaMllty of four roluMylty models. When urlng Ilterature model parameten, the SkJoldJ0rg.nren group-contrlbutkn equatlon of state glves the best w e e m w l wlth the experimental results wlth an average devlatlon of 15 % . The Wave-Redllch-Kwong and Peng-RoMnron equatkns 0.01 g per reading) and a Mettler H10 balance (Inaccuracy 0.1 mg per reading).Degassing and venting of the system was possible using a three-way valve (10). I n order to be able to obtain phase-equllibrium information from the HTHp apparatus, it is necessary to know the volume of the bomb. Also the volume of the supply cylinder (together with the connection lines, valves, and manometer) is needed. Volume measurement was carried out by filling the relevant object with gas (helium or nltrogm) at a high pressure (>50 bar)