Vapour pressures of ethylene glycol, hydroxyacetaldehyde and hydroxyacetone were measured by using a standard closed system equipped with a vacuum line, built recently in our laboratory. First, our vapour pressures measurements of ethylene glycol and their excellent agreement with the literature in the studied temperature range, i.e. (308 to 385) K, permitted us to validate our experimental set-up and procedure. The data obtained in the temperature ranges (296 to 356) K and (273 to 304) K were very satisfactorily (Absolute Relative Deviations (ARD) < 2.5 %) fitted according to the Antoine's equation: log10 (P°hydroxyacetaldehyde / Pa) = 12.96 ± 0.82 -(3657 ± 238) / T/K and log10 (P°hydroxyacetone / Pa) = 10.13 ± 0.06 -(2201 ± 153) / T/K. Then, the resulting vapour pressures of both hydroxyacetaldehyde and hydroxyacetone at 293 K were P° = (3.0 ± 0.2) Pa and P° = (415 ± 20) Pa for hydroxyacetaldehyde and hydroxyacetone, respectively. The quoted errors correspond to 2 obtained from the least square fit analysis and the estimated systematic relative error of 5 %.Finally, these experimental expressions of temperature dependences of P° permitted then to derive the enthalpy of vaporization for both compounds.

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