The partial molal volumes or 47 mono- or polycyclic alkanes, ethers, alcohols, ketones, and bromides have been determined in carbon tetrachloride at 25 °C. of most of these compounds can be calculated with moderate (±1–2%) accuracy using an equation containing parameters previously developed for acyclic compounds, and an additional cyclization parameter C, which is roughly linear with the number n of atoms in the ring, from n = 3 (C = +5.3 mL mol−1) to n = 10 (C = −21.0 mL mol−1). Substituted cyclohexanols and some polyfunctional compounds had considerably lower than calculated.