“…Organic liquids composed of small molecules have been used as probes to study the alterations in chemical properties in coals. − The purposes of previous coal−liquid studies vary widely, ranging from extraction studies to studies oriented toward understanding the molecular-level forces and bonding present in coals as well as between the coals and the liquid probes. This group has used wide-angle X-ray scattering (WAXRS) to examine the effect(s) of small organic liquid molecules on the molecular-level structuring in the three Argonne Premium Coals noted above. − Of the liquids used to date, pyridine (PYR) causes the most easily observed swelling of the coal and converts both Beulah Zap lignite and Pittsburgh No.…”