A round casting is 0.2 m (7.9 in.) in diameter and 0.75 m (29.5 in.) in length. Another casting of thesame metal is elliptical in cross section, with a major-to-minor axis ratio of 2, and has the same lengthand cross sectional area as the round casting. Both pieces are cast under the same conditions. What isthe difference in the solidification times of the two castings?

Describe one experiment in which the glass transition temperature and melting temperature of a totally amorphous thermoplastic material can be determined. show the relevant experimental results in a diagram which should be properly annotated with the two temperatures clearly marked. what is likely to happen to the curve in the diagram if the amorphous polymer is replaced by a thermosetting type?