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Heat Pad, 3" x 3"

Item # 93-1010

Regular price $8.00
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This well-known experiment demonstrates the release of latent heat during a phase change as a supersaturated solution of sodium acetate trihydrate rapidly crystalizes.

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Heat Pad - Large Heat Pad - Large Item # P3-1015-03
$17.00 10 $15.80

Additional Details

This heat pad is made from a supersaturated solution of sodium acetate trihydrate. Above +58 degrees Celsius sodium acetate trihydrate is always a liquid; below about -10 degrees Celsius it is a solid. Normally, the salt would crystallize as it cools below +58 degrees Celsius, except under special conditions such as with the heat pads. Thus, it can easily exist at room temperature as a supercooled liquid. The trigger button is the mechanism for producing the seed crystals that initiate the phase change. The phase change from liquid to solid releases latent heat, making these heat pads very useful for easily contained calorimetry experiments and a host of hands-on activities.

WARNING: This product can expose you to chemicals which are known to the State of California to cause cancer, birth defects, or other reproductive harm. For more information go to

Products being sold are not toys. They are for Educational / Laboratory use only. They are not for use by children 12 and under.


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