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Sodium Acetate Heat Pack & NH4NO3-CaCl2 Cold Pack
Heat pack uses supersaturated solution of sodium acetate induced to crystallize by motion of metal plate. As salt precipitates, temperature of solution rises to melting point of the salt (58degC). Cold pack uses ammonium nitrate, water & calcium chloride.
Copyright:© 1999 Richard Megna - Fundamental Photographs
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