All samples tested were introduced in beakers of 50 ml under a
controlled room temperature of 20 ± 1.0 C. An atmospheric
pressure of 0.855 ± 0.5 atm was determined with a conventional
piezoelectric barometer. A relative humidity of 70 ± 5% (% Hr)
was measured with a 10.2 cm synthetic-hair thermo-hygrometer.
Both parameters were constant throughout the test. In all tests,
an initial volume of 40 mL was used and, periodically, it was
weighted in a balance model Shimadzu Auw 120 D with an accuracy
of ±0.001 g and time was registered with a chronometer with
an accuracy of ±0.01 s. From both accuracies, the experimental
uncertainty for the evaporation rate was calculated as
±0.00034 g/h. The beakers and the balance were introduced into
a climatic chamber in order to avoid ambient air flow fluctuations
during measurements. During first 24 h the measurements were
more frequent to evaluate in detail the evolution of evaporation
losses, especially for the most volatile alcohols. After that, samples
were weighted each 24 h. The total duration of the experiments
varied from 84 to 96 h. Once experimental results were obtained,
these were compared with the modelling results.