Quote:
Originally Posted by JamCan
Yea! My question is I wonder if it stays forever?
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No, JC they dont indefinately.
The heat is caused by a chemical reaction that continues until all teh molecules start to slow down and lose exothermal abilities.
Years ago they were used by the miltary based in Arctic and antarctic regions of the world, to warm the outside of their engines as an aid to cold starting.