Reply #5: Sure there is a heat gradient

[madokie]

exhaust from a car engine for example is hundred of degrees where the ambient temperature is 120 or so at most, way less most places most times.
Anything else you want to try to make this sound like it is a waste of time? :hi:

Heat gradient does not mean a hot and a cold as such it means heat and a lesser heat, dummy. Just kiddin' about the dummy part but you get the picture I'm sure :-)