Great analysis on whether Hell is exothermic or endothermic. http://www.pa.msu.edu/~raman/FunPhysics/hell.htm

Okay for those of you who don't know what these stand for or have forgotten what they are, here goes:

Exothermic / Endothermic?
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Any system which is hotter than its surroundings and hence gives out heat is termed Exothermic

Any system which is cooler than its surrounding and hence absorbs heat is termed Endothermic