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I4-34. Hand Warmer
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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
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.
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See pagesi1. thermal properties of matter
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See pagesi2. transfer of heat
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See pagesi3. gases
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See pagesi4. changes of state
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See pagesi5. laws of thermodynamics
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See pagesi1. thermal properties of matter
-
See pagesi2. transfer of heat
-
See pagesi3. gases
-
See pagesi4. changes of state
-
See pagesi5. laws of thermodynamics
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Physics Lab Demos