How is hot ice made?

Answer 1

If you're thinking along the lines of artificial heating or heating pads/hot ice;

Sodium acetate trihydrate crystals melt are melted at around 58 °C, dissolving in their crystallization water. When they are heated to around 100 °C, and subsequently allowed to cool, the aqueous solution becomes supersaturated. This solution is capable of supercooling to room temperature without forming crystals. By clicking on a metal disc in the heating pad or whatever container this solution is contained in, a nucleation center is formed which causes the solution to crystallize into solid sodium acetate trihydrate again. The bond-forming process of crystallization is exothermic, hence strong heat is emitted (which can be very dangerous if exposed to skin and cause second degree burns). Hope that helps. Make sure to recommend. Cheers :)

Joey, MIT undergrad

Answer 2

Hot ice, also known as sodium acetate, is made by dissolving sodium acetate in water and heating the solution until all the crystals are dissolved. It is then allowed to cool slowly, encouraging crystallization. The resulting solid is technically a supercooled liquid that solidifies on contact with impurities or disturbance, appearing as solid ice but warm to the touch.