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I4-34. 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.

I. Thermodynamics

I. Thermodynamics

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