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Iodine crystals will quickly begin to deposit on the base of the finger and start. With attention, the heavy purple vapour can be maintained at a level just below the base of the finger. As you heat gently with a Bunsen, the iodine will begin subliming almost immediately. very symmetric molecules like cubane, adamantane, benzene. Put the cold finger into the flask and place them onto a tripod and gauze. This fits observation rather well - keeping in mind that no theory up to now predicts melting points.

Fuelled with our passion to make clean & safe beauty more accessible we’re always on the lookout for like minded individuals who aren’t afraid to chip in with ideas and a little extra hard work. It’s always a fun & happy environment here. There is a process in tee shirt imprinting that uses that process to make ink become a vapor that bonds with polyester, known as dye sublimation. Want to join the Sublime Family We’re a close knit bunch that believes in having a good time while we do what we love. Such as dry ice when heated becomes water vapor. So stiff and symmetric molecules solidify almost as easily as they condense, have a small liquid range and can under some pressures sublimate, while deformable and unsymmetric ones condense easily but need a much colder temperature to solidify, showing a wide liquid range. Sublimation is when a solid item becomes a vapor. As well, deformable molecules can attract an other at one or few atoms, but have rarely the proper conformation to fit optimally an other and make a solid. In this image of liquids and solids, molecules that are unsymmetric can touch an other with an unfavourable angle, attract an other a bit, and make a liquid, but are less probable to have the favourable orientation that lets them make a solid. My partial understanding is that in a solid, malecules attract an other through several points at once because they are properly organized, while in a liquid, only one or few points attracts them at a given instant. The same kind of bonds let a compound condensate and solidify, so "only van der Waals" and similar reasons would tell why a compound both melts and evaporates easily, not why it sublimates, that is goes directly from solid to gas - why it evaporates about as easily as it melts.