Hand Warmer

Purpose

To demonstrate the heat of fusion.
 

Equipment

Hand warmer.

 

Suggestions

Before re-using this gizmo, it must be boiled to put the heat back into the sodium acetate and change it back into a liquid.
 

Images

i4-34

Description

A plastic bag contains a supersaturated solution of sodium acetate. When fusion is commenced by clicking a metal disc in the solution or by some other shock, the liquid quickly becomes solid, producing a large amount of heat.
 

References

Manufacturer's sheet.