The Thermophysical Symposium in Boulder that takes place every three years is surely one of the top events in the field of experimental thermodynamics. Hosted by the National Institute of Standards and Technology (NIST), located on the campus of University of Colorado, and guarded by the famous Flatirons rock formations, every aspect of the conference is perfect. Catering in the Center for Community, the accommodation in the dormitory, and the lecture rooms are within a pleasant walking distance, close enough to exercise between sessions without getting tired.

Presented topics focused mainly on thermophysical properties of environmentally important working fluids (F-gases, fuels, hydrogen, and carbon dioxide) concerning the experimental point of view or development of correlations, preferably equations of state. Still, several sessions were closely related to BEST-CSP Action: Properties of solids, Properties of metastable, nucleating, and glassy systems, or Correlations, databases, and engineering equations of state. Many of the speakers at the Symposium were naturally from NIST Thermodynamics Research Center (TRC), but the participation from central Europe, especially Germany, was surprisingly strong this year.

The ASSURE-X23 initiative I presented raised the interest of Dr. Vladimir Diky and Dr. Ala Bazyleva (NIST TRC) and Dr. Dzmitry Zaitsau (University of Rostock). Dr. Ala Bazyleva expressed interest in the BEST-CSP Action and we discuss the possibility of her engagement in the ASSURE-X23 initiative currently. An evident synergy was also found between the BEST-CSP Action and current research intentions of Dr. Dzmitry Zaitsau, who discussed the possibilities of employing DSC technique in the study of solid-liquid equilibrium phase diagrams for binary mixtures in his contribution.