What are features of an isentropic process? . derive expression describing variation in pressure with specific volume for such a process occurring in the ideal gas. assume that specific heats (at constant pressure and constant volume) are not varying \n temperature. what real processes can be modelled with use of the isentropic process?

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?