Describe three examples of mass transfer that relate to your daily life. For each example give the following: (a) A sketch of the physical situation in which mass transfer is involved
(b) A sketch of the concentration profile and the values at the two boundaries.
(c) An estimate of the time constant for mass transfer and the basis on which it is determined.

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?