Excess molar volumes V-M(E) were measured as a function of mole fraction at T = (293.15, 298.15 and 303.15) K and atmospheric pressure for {(tetrahydrofuran or tetrahydrothiophene)+(hex-1-yne, or hept-1-yne, or oct-1-yne)}. The results of the hydrogen-bonded mixtures are discussed in terms of. alkyne chain length; molecular size and temperature dependence. (C) 2003 Elsevier Science Ltd. All rights reserved.