Uncertainty of thermodynamic properties available via online data banks: Vapor pressure as case study

The aim of the work is to highlight the limitations of properties data commonly used in engineering estimations, as well as the importance of accounting for their uncertainty. Following established metrological guidelines, a full procedure have been developed, with particular considerations aimed to account for the ‘quality’ of the realization of the definition of the measurand as a source of uncertainty of the property. The case study considered was the vapor pressure, a property commonly used in processes involving vapor-liquid equilibrium, common in the industry and climate related calculations.