Hot And Cold Compresses
by Science Photo Library
Title
Hot And Cold Compresses
Artist
Science Photo Library
Medium
Photograph - Photograph
Description
Hot and cold compresses. These contain a chemical (ammonium nitrate for cold, magnesium sulphate for warm) and an inner bag containing water. By squeezing the outer bag, the inner bag is ruptured and the water mixes with the chemical. In the case of ammonium nitrate, the reaction is endothermic and for magnesium sulphate the reaction is exothermic.
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October 3rd, 2018
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