The structure of aqueous solutions of 1,2-butanediol and 1,4-butanediol was investigated using adiabatic compressibility measurements
and positron annihilation methods. In the case of 1,2-butanediol the experimental results are very similar to those obtained
earlier for systems where hydrophobic hydration dominates. In both cases there are evidences for increased rigidity of the
water network, which arises from the formation of hydrogen bonds between diols and water. The usefulness of both the methods
applied in investigating the structure of liquid solutions was proved.