Hot ice is an exothermic reaction. It's sodium acetate. It can be made at home with baking soda and vinegar. The sodium acetate is cooled below its melting point. When it's crystalized it crystalizes in an exothermic process. This makes the ice hot. If it's made a certain way it can get hot enough to give you severe burns.
Hot ice or sodium acetate is the same stuff found in hand warmers. Hand warmers are used to warm you up. Usually when it's cold oustide and/or snowing. Hot ice in a container of some sort can be used the same way.
Source:
Anne Marie Helmenstine, November 29, 2014, http://chemistry.about.com/od/homeexperiments/a/make-hot-ice-sodium-acetate.htm
Very nice information for Exothermic Welding System provide contact surface area is 100% not analogous to any chance of oxidation. The technology is mainly used in higher applications like rail tracks, etc.
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