Unveiling the internal pressure polytherms for ethylene glycol and monoethanolamine in aqueous solutions: A modeling approach

•Internal pressure (Pi) of diol and monoethanolamine aqueous solutions was modeled.•Buckingham function recreates the Pi within 5–60 °C if solvent content more than 5 %.•Modified Buckingham function describes Pi if solvent content in water less than 5% The Buckingham's function is proposed as a valid tool to approximate the polytherms Pi, i.e., the internal pressure of aqueous solutions of ethylene glycol and monoethanolamine in a wide temperature range (278.15–333.15 K) using physically understandable realistic model. It is shown that the proposed modeling function approximates the temperature dependences of Pi for a great majority of aqueous solutions under scrutiny with an error of less than 3 %. In situations where the adequacy of basic Buckingham model is less significant, the use of a modified Buckingham function is suggested.