Asteel pressure vessel containing steam sits idly on the floor of a factory while waiting to be utilized. it contains 40 kg of superheated steam at a pressure of 400 kpa and 300'c. after a period of time, the gauges on the tank now read 250 kpa and 250°c, what is the change in entropy for the steam over this time period?

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?