Superb, thank you very, very much. I am very new to this subject and also seriously dyslexic - and a few other similar impediments/complications. In order to get my head around things, I need to have a few higher level knowledge/comprehension hooks established within a mental framework of a subject in order to hang/anchor the masses of lower level pre-requsite base knowledge upon, or else, it simply does not stick. This video has answered, at least in part, many questions that have been springing to mind as I have watched numerous videos over the past few weeks, thence helping to establish those conceptual hooks. I have no idea if the above will make any sense to you, however, please be aware that you have profoundly helped out a person with learning impediments who is extrememly grateful to you for your gift, Nick.
x-axis is fraction of heat transfer. Specific heat of air is constant over temp range from T_in to T_out. If cp was highly dependent on T, then would not be straight line.
