2007年7月3日星期二

Make instant Hot Ice

I watched the video, now I'm not going to be happy until I get some sodium acetate. The chemical name makes it seem more complicated than it is, but no less freaky
clipped from www.hackerzen.com

Sodium Acetate is really cool because it has a "freezing" point of around 130°F (54°C). By heating the sodium acetate in water, you're bringing it past it's melting point. When you cool it, you're actually supercooling it below it's freezing point without letting it crystallize.

Once you touch the solution, a nucleation site is formed, allowing it to recrystallize. The solution quickly jumps to its freezing point once the crystallization process begins, bringing it back up to about 130°F (54°C).

To reproduce the experiment, you can buy some sodium aceteate here. If you'd rather make it yourself, sodium acetate is one of the byproducts of mixing baking soda and vinegar (like the classic homemade volcano).

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