Which of these fuel characteristics helps to prevent the air fuel mixture from spontaneously igniting in the combustion chamber?
Select one:
a. The ignition temperature
b. The cetane rating
c. The octane rating
d. The antiknock rating

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?