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I don't regard this as an indication that they think heat is a substance.
Ok, anecdotal: Ask any student (even half the grad students you know)
to explain why the flame of a match points upwards and he will tell
you "heat rises" pretty much of the time.
That this does not mean heliumI disagree. I think it indicates that underlying assumptions went
balloons are hot and does not explain flames in zero g environments
is immaterial -- it indicates a readiness to conceive of something
along the lines of a caloric model for cultural reasons.